OH GOD PHYSICS!
Here's some stuff I made.
Here's a quick tutorial (there's more to this game then you think!)
Click on the Image to download the game (for Windows)
Mac users can download the game here.
Linux users? Sorry to say that even though the engine is a Linux OpenSource app (Octave, found here),
there is no Linux version as of yet. I'll give it a try in Wine later. Good luck!