Does this have a free world?

[Headless]

...

[Shavinfroc]

well its sandbox

[Headless]

Okay, is it worth it?

[Athrul]

If you mean an open world, as in one big map you run around in: no.

You play individual levels. Those are completely open, though.

As for your second question, I have tried to answer it a few times and this is the summary of it so far:

I cannot give you a straight answer to that. But I will try to give you an overview of what the game has to offer right now, so that you can make up your mind.

Gameplay:

The game has two major gameplay selling points. The movement and the combat.
Movement: The game lets you move around very quickly. You can jump up very high and you can run along walls and jump off of them and grab ledges to reach higher platforms. All these features are very easy to control and feel very fluent. The game lets you move around at high speeds and jumping around like that is very satisfying for some people.
If you just want to have some stupid fun you can use the debug keys to slit your character's throat and enjoy the way blood is handled in the game or making enter one of the ragdoll modes and watch him tumble down a cliff.
[/u]Combat:[/u] The combat is absolutely outstanding. Every move is triggered by your own movement and the character will perform the most appropriate move for his position in relation to the opponent. This may sound as if it was automatic, but the way the fights are handled in the game actually gives you complete control over what you are doing. After some training you will be able to position yourself just right to do exactly what you want to do.
For me, the hand to hand combat is just about perfect. It's probably the best combat I have ever seen in an action game. Every move has its purpose and you can really use tactics to fight certain opponents. The weapons still need some more balancing in my opinion, but they are fun as well.
Is it fun?: You have to keep in mind that there may be a bunch of maps and even an arena that puts in one fight after the other and makes the opponents tougher or weaker depending on your performance, but none of that is tied together by any sort of story yet. If you get your fun in games from progressing through a story and moving from one map to the next one, you should probably wait until the campaign is there. If you enjoy combat and like to play around in a sandbox style game, you can already get it and will have fun with it.

Map Editor and making your own stuff:

The game has a map editor. It is still pretty bare bones, but you can create simple maps fairly easily by editing an existing map, putting models into it, modifying them and then saving it. If you invest some more time you can create more elaborate maps, for example by putting cutscenes in that trigger when the character reaches a certain point. There are many tutorials available for more complicated things (e.g. creating your own terrain so that you don't have to edit an existing map, or for creating caves), but creating your first map is pretty easy.
Some more experienced users have created custom characters and models to give the community more stuff to play with. Maybe you have some experience with modelling and would like to do that too.
Is it fun?: If you like creating stuff the game has plenty to offer, even if you are not a very technical person. The map editor is easy to use and you can create your first map in a very short time. If you have some experience, you can create your own models, characters and complete maps. There are tutorials on the Wolfire Forums that can get you started.

Community content:

The community has created tons of stuff that you can add to your game. There is even a tool, the SUMLauncher, that will help you to install maps, objects and characters with just a few clicks. It cannot handle script mods, but that feature will probably be added at some point.
Maps: There are very many maps, ranging from very simple attempts, to parkour maps and massive structures for you to explore, all the way elaborate maps that tell little stories. Some maps are also used to present custom assets.
Custom content: This content comes in the forms of new characters (a few examples: we have a few human characters, a bird creature and a zombified version of the main character), new weapons, objects for building structures (e.g. assets to create a modern city with streets and skyscrapers, or a Viking scene), objects tied to scripts (e.g. a landmine, a homing missile, rain, snow, water), new moves and probably some stuff I am forgetting. It's a lot.
Mods: There are also a few mods out there. Some change little things about the game, some add features and some change the gameplay. My Favourites are Last's Blood Mod and Korban's First Person Mod. The first person mod is pretty self explanatory. The Blood Mod started as a mod that gave a you a few options to make the game more or less bloody, but has since become a collection of a few mods. A few of the features that can be activated individually: there's a flying mod. It lets you flap your arms to gain height and glide. The controls a very fluent and you can get some serious speed while gliding. There is a feature that makes your character enter ragdoll mode if you run into a wall or another character at high speed. This can effectively be used as tackle. It adds a few debug keys, for example to make you invincible. There are also some experimental features.
These mods have to be installed manually and are often not compatible with one another, since they edit the same files, but installing them is usually just done via drag and drop.
Is it fun?: The community has created so much stuff for users to play with. If you preorder it you should definitely check it out, especially if you want to make maps yourself or get into modding the game.

Closing points:

I hope this helps you to come to a decision. Please take your time. This game probably is not for everyone and 30$ may not be very expensive for a game, but since it is still an alpha some features simply are not there yet and you will have to put some trust into the developers. If you cannot do that right now, you should probably wait.
Please also keep in mind that there are many videos online that can show you the game in action. I especially recommend the videos of Overgrowth Weekly.
https://www.youtube.com/channel/UCrdInI6WObozTTRW_59p6wg
He has some of the best tutorials especially for parkour and combat. But he also tells you how to get the game in the first place and how to use the editor.
Parkour tutorial:
https://www.youtube.com/watch?v=dSB1EPAJZ9w&index=4&list=PLD49A116260D9ADA6
Hand to hand combat tutorial:
https://www.youtube.com/watch?v=zKhdzZA3dZE&index=5&list=PLD49A116260D9ADA6

The uploads by Wolfire themselves also feature a lot of gameplay and editor footage and alway tell you the latest additions to the game.
https://www.youtube.com/user/WolfireGames


One last thing. If you eventually decide to preorder the game, compare the prices on Steam and the Humble Store. Both will give you the same thing, but depending on your region Steam might be more expensive. Both websites also have it on sale from time to time.
Getting access to the Secret Preorder Forum on Wolfire is also a lot easier if you preorder from the Humble Store. I have read many complaints from people who had trouble getting access after preordering from Steam. If you preorder from the Humb le Store you will be able to get your Wolfire account the way people have done it ever since the game was announced and you can get it on Steam with two or three clicks from your Humble Store page.

[kozz]

It's Alpha. so it means it isn't nearly finished. They were going to add a campaign mode, but not now, your job is to test out the game and find any of the bugs. So yes, it is a free world. It is DEFINATLY WORTH IT. BUT.IT.NOW. I can't stress how good and smooth this game is.