OH GOD PHYSICS!
Here's some stuff I made.
Here's a quick tutorial (there's more to this game then you think!)
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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!