Besiege is an indie physics game where you build medieval siege engines that take down fortresses.
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Pros
Pro Beautiful design
Each level takes place on a stage of blank white, giving the users unlimited space to test machines. The destruction of machines, buildings, and NPCs in this game is graphic and hilarious.
Pro Encourages creativity
In each level, the player is given an objective. The objective can be reached in any way. Players are able to build a huge variety of custom weapons and vehicles. Potential vehicles include airplanes and helicopters, tanks, catapults, hot air balloons, and more.
Pro Active community
There are loads of forums where you can discuss stuff about the game, share creations and ideas and look for servers you can play on.
Pro Sandbox Mode and Multiverse (multiplayer and level editor)
Remember, it's not just levels! In the Sandbox you can test your machines which is neat. The Multiverse has a lot to offer as well: the multiplayer function and the Level Editor. You can upload your levels to the Steam Workshop (Steam only).
Pro Community Workshop (Steam only)
In the Workshop, you can post your creations for other users to use and you can download other people's creations.
Cons
Con Another one of them games forever stuck in Early Access
Con Still in alpha testing
Some of the best features of this game are still in development. The final version isn't said to be released until mid 2016.