Sorry about the first one... there was an unexpected glitch and I had to delete it. So as a treat, I upgraded this verson for you all! You can now adjust friction and gravity, and even load some built in models. And most glitches are gone.
QUICK START: Hit BEGIN SIMULATION (on instruction screen), hit PERSON (under premade models), hit BEGIN SIMULATION and play.
There is no full version to this game, anyone giving links in reviews is just spreading a virus.