Finally a physics game, good gameplay!
I didn't gave you much points for graphics and style, but the gameplaywas freaking good! I really liked the way how the levels advanced.
Change the music though, i suggest merce my of alkaline trio :p
And maybe some powerups... and a timer that lets you see when the level will change!
And your next challenge should be verlet integration to create ragdolls, i did it so it cant be hard ;-)