My issues:
Physic is not as good as it can be:
1:
if you want to build anything with ton of pistons and rotors better pray to Clang or your entire construction will probably lob itself into space with terrifying speed.
2:
Physic is not very realistic for example in base game you can slap down thrusters really everywhere you want and it still will fly/drive perfectly. To fix this you must install realistic thrusters mod.
3:
No atmospheric friction this is self-explanatory. Atmospheric Drag and Reentry mod fix it
4:
Sometimes wheels especially on very heavy rovers do strange things for example glitching through armour and lunching to space
5:
There is no such thing as heat more precisely it is such thing(damage drop thrusters) but is very poor. If there where richer mechanic such as for example thrusters overheating game depth will irascibly increase
6:
Atmospheric thrusters do not require air supply. As long your thruster is in atmosphere you can place it everywhere you want such completely close room which no air supply
Game also has some annoying lacks such as:
1:
No visible thrusters specification such as power consumption or generated thrust. To find such values you must search on wiki
2:
No build in calculator this is super annoying because you must alt tab to calculate anything + it throws you out of immersion. + Win calculator is f piece of ♥♥♥♥. So if you need to perform calculations go install python or GNU/Octave(FORTRAN)
+ Exact formulas for force in game will be uses full or reminder table which basic Newton physic laws
3:
Some form of easy text editor will be very useful to write down what are you calculation
4:
Ship menu is awful for example if you want to create group for rotors on 1 side of your ship you must brute force it because enumeration is calculated on time and previous placed blocks and get really messy when you are removing and adding that same block many ways
5:
This is super subjective but I will include it here. IMO C# is awful for scripts, because it is high level language that require compiling + it looks like c++ which brain shake. Python nim or such high level easy to read intuitive language will be way better.

Summing everything SE is very good game but if you are interested in having fun with engineering it is not game for you. But if you are here to construct things only to look nice and have some minimal physic sense and functionality yes it is game for you.
If you are in case 1 go check Kerbal Space Program

(if there are any errors in text english is not my native language)

My issues: Physic is not as good as it can be: 1: if you want to build anything with ton of pistons and rotors better pray to Clang or your entire construction will probably lob itself into space with terrifying speed. 2: Physic is not very realistic for example in base game you can slap down thrusters really everywhere you want and it still will fly/drive perfectly. To fix this you must install realistic thrusters mod. 3: No atmospheric friction this is self-explanatory. Atmospheric Drag and Reentry mod fix it 4: Sometimes wheels especially on very heavy rovers do strange things for example glitching through armour and lunching to space 5: There is no such thing as heat more precisely it is such thing(damage drop thrusters) but is very poor. If there where richer mechanic such as for example thrusters overheating game depth will irascibly increase 6: Atmospheric thrusters do not require air supply. As long your thruster is in atmosphere you can place it everywhere you want such completely close room which no air supply Game also has some annoying lacks such as: 1: No visible thrusters specification such as power consumption or generated thrust. To find such values you must search on wiki 2: No build in calculator this is super annoying because you must alt tab to calculate anything + it throws you out of immersion. + Win calculator is f piece of shit. So if you need to perform calculations go install python or GNU/Octave(FORTRAN) + Exact formulas for force in game will be uses full or reminder table which basic Newton physic laws 3: Some form of easy text editor will be very useful to write down what are you calculation 4: Ship menu is awful for example if you want to create group for rotors on 1 side of your ship you must brute force it because enumeration is calculated on time and previous placed blocks and get really messy when you are removing and adding that same block many ways 5: This is super subjective but I will include it here. IMO C# is awful for scripts, because it is high level language that require compiling + it looks like c++ which brain shake. Python nim or such high level easy to read intuitive language will be way better. Summing everything SE is very good game but if you are interested in having fun with engineering it is not game for you. But if you are here to construct things only to look nice and have some minimal physic sense and functionality yes it is game for you. If you are in case 1 go check Kerbal Space Program (if there are any errors in text english is not my native language)