Let me be straight. This game is not for everyone. The modeling process is very close to the real deal modeling programs like Solidworks. The programming interface is literally a giant block diagram that is used in every system control application. To solve some control problems, you even have to use some real engineering knowledge. This means, if you do not have a strong engineering background or an engineering spirit, this game will not be as enjoyable and can be frustrating.

So please take this recommendation with a grain of salt.

First off, I love the game and its idea. I cant wait to see what the community comes up with.

Second. I would love to see a "BATTLE BOTS ARENA!!!" with flamethrowers, buzzsaws, and flippers.

If you could fight other robots, this would go from a 10+ hours game to a 100+ hour game. Replayability out the @zz!

Frustratingly Fun.

This game is definitely a contender for the category of engineering digital vehicles for various results, but it definitely feels lacking in certain areas. The tag line that interested me in this game was, "Imagination is more important than knowledge." Well, I found that to be completely false. The game does a lot really well, such as the ability to tweak and curve your designs, and map your programming out for ease of use. But trying to make vehicles for air and sea proved to be frustrating in a major way to me.

The Good
+ Very free-form chassis crafting. The ability to bend bars, and tweak the precise lengths and angles of everything (on a square grid) is very nice. It certainly lets you run wild with your imagination
+ Command Map lets you see exactly what you are having different key-binds doing on your build. It can be a huge help when you aren't sure what is causing your creation to malfunction
+ The world and materials are simply lovely. The graphics aren't overly flashy, but they are relaxing and beautiful.

The Bad
- An annoying set of tools for center of gravity and thrust vector, that all kind of just overlay onto each other. Maybe I missed how to cycle through these tools one at a time, or maybe...
- The tutorial is ridiculously sparse. It explains some of the basic tools and how to use them, and then tells you to go to YouTube if you need more *knowledge*. The Tutorial doesn't cover buoyancy, aerodynamics, or lift.
- There seems to be no Aerodynamics viewer. Now, this isn't a terrible issue in and of itself, but when paired with the fact that there are not pre-made wings and you have to design them, this tool (or a smoke/wind tunnel) would be a huge improvement.

The Summary
I think this is a good game. I feel like it will only get better and better as the community expands and shares more ideas. However, when compared to a couple of titles that where already in the genre, the game feels like it is lacking in some areas. I would say this game is worth it if you can get a 15%+ discount. At 20$(USD) it feels just a touch steep for me.

This is exactly my kind of game and I have hundreds of hours in basically every similar game, I want to love this, but it has enormous issues:
- In multiplayer this game crashes for at least one player every 1-2 minutes, usually when doing fairly normal things like moving a servo (even with nothing attached) or use the bend tool. This is with only two or three players, not huge servers.
- When melding the shape of chassis pieces the game fairly regularly twists the grid by 45 degrees for no reason, making it impossible to make the correct adjustment without deleting and rebuilding the plate.
- It has some extremely annoying behaviour with even the most basic designs, wheels will bounce and veer off course even on perfectly geometrically flat terrain making even the simplest cars completely unreliable without thruster assistance. I have no idea what the game wants me to do that might fix this, every workshop vehicle just uses internal thrusters to cheat the physics.
- There's very, very little to do. Bot Brawl doesn't seem to allow any real customization and there's a huge lack of weapons that aren't the smallest block size possible, world logic design is also very obtuse and isn't clustered in a UI like vehicles and is instead a bunch of floating blocks you must fly around to connect which is incredibly tedious.

It might one day be good, but this game is ABSOLUTELY still in fairly early Early Access and has absolutely no right to be calling itself a released product. Even the most basic behaviour for an engineering game will cause hard crashes and unpredictable physics anomalies.
I will change this review the absolute second I find any of these issues are fixed because this is absolutely fixable.

only one problem whitch is my building skills so thats my fault not the devs

Let me put this straight. this is a very good vehicle creator game, i would personally choose this over Dream Car Builder, Trail Makers and even Besiege. However it also has its flaws.

Let me explain, so first there is the programming, which is a really cool and easy to learn system where you can use stuff like averages, exponential curves and trigonometry to make cool builds, however there's close to no point in using these complex programming nodes as the aerodynamics system barely affects the vehicle (rendering stuff like active aerodynamics and air brakes useless, also i haven't been able to make a helicopter because of this) so my main gripe is that the aerodynamics are not strong enough (or they don't exist, however it says you can build planes and there is a helicopter in the cover art so i believe it exists to some extent)

i might just be doing it wrong but i havent noticed anything in the way of aerodynamics (i got the same lap times with a box as i did a aerodynamic car, and as i said i couldnt build a helicopter) so if any of you (including devs) could confirm this for me this would be great

But that's really the only thing that truly breaks the game for me. the building system takes a bit of time to learn but once you learn it it is really simple and honestly the best I've seen yet (kind of like a simplified version of blender which you make a car shape with and then stick wheels on and stuff) There also isn't much content in the game however its in early access so i cant complain (offline racing against bots would be nice, As well as leaderboards).

so to sum this up, this is a fun game with a building system which has the potential to be amazing, however the physics limit it a lot, and in this current state there isn't a massive amount of single player content (there's missions and a sandbox)

This game has a bot brawl mode where you can battle with your own creations or with available ones from the steam workshop against others, a bit like the famous show 'Robot wars'
In addition, you can also complete challenges with which you can unlock parts and items for adding to your creations or simply in a sandbox mode where you also have all parts at your disposal.

In this sandbox mode you can also choose between a few different locations such as a very detailed landscape with a race track or the vacuum environment of space.
Yes, spaceships are also one of the possibilities that you can build and what is nice is that you can drive these vehicles online in these locations.

Main Assembly is a very user-friendly constructive racing / free-play game where the results can be infinite based on creativity and the building skills of the players.

You don't have to be a genius to build a working vehicle here, the basics are pretty straightforward but there are plenty of parts and features that can make the creations as complicated as you allow.
This is reflected in the many available vehicles on the steam workshop page, which certainly provide a lot of extra fun in Main Assembly.

Here's a little showcase of some of these fun vehicles: https://www.youtube.com/watch?v=qqoA2pPcIj4

A lot of great ideas, but unfortunately it now looks the game is abandoned since august 2021 half-finished in a lot of aspects. It had a significant amount of potential with a fantastic shape editor, world editors etc... The problem is the devs just never polished anything to the point it needed to be.

I want to recommend it, but since it hasn't received updates in well over 1½ years i unfortunately can't do that. Everything is a little half finished and half-tuned.

Can't recommend if you are like me and have a bad internet connection. The game doesn't like it and kicked me back to the main menu multiple times erasing all of my progress. So I can't play unless I get a better internet connection or the developers add an offline mode .


Edit
After searching in the Steam Discussions I found out that it is a bug, the game isn't supposed to require an internet connection. The developers know about it but haven't fixed it yet.

If you have a creative drive or artistic eye, this game is great for allowing you to express yourself through your builds. The controls are a little wonky to start with and the building "flow" seems un-intuative at first. But it doesn't take long to figure out how things work. If you have any experience with 3d animation or model building, this is definately in that "wheelhouse". This feels more like working with clay, than sticking blocks together. There's a decent amount of additional add-on pieces like hinges and servos, as well as pistons and specialized tools like the suction cup or drill head. The physics in-game are decent as well. Although, to me, the atmosphere feels thin. When taking off in a flyer, it feels more like your breaking the surface friction, than pushing yourself through the air resistance.
The Programming portion of the game can get a little scary when you first start using it, but it only needs to be as complicated as you want it to be. Simple things like Power and Steering for a vehicle are pretty straight forward and the game tries to help by having some of these attributes built into certain parts. Which allows you to start building creations without the stresses of programming.
To sum up, I'm only 17hrs into the game, but I'm hooked:) This game can only get better from here.
See you on the Assembly Line:)