I just played a bit of it a year or two ago, it was still on pre-build/super-alpha/ver 0.01/or whatever is it called.. there no gameplay, you just build whatever contraption u can think off using the available resources (like wood blocks, wheels , ropes, propellers, etc) that abides physics in order to work.. and kill the mannequins.. I think the purpose of the game was for you to build your own siege weapon..