I took a couple mins off my boss' time to play your game.
Unfortunately it didn't run too well. It was dreadfully slow, animations were going at like <1 fps. I blame my pc for a good portion of it as it has a terrible gfx card I also understand there must have been little time to optimize things.

There didn't seem to be a collision response either. After hitting one of the 'retards' it didn't seem to affect the lifebar. Again, this might be due to my pc. The grid, Dirk mentions, can be corrected by resizing the screen a bit.

Anyhow, none of this really matters. I can see from the images that you've all had a good time making this game. I can only :clap: and say, great job :thumbup: