Performance Improvments

Even though this game was just intended for the Low Quality Game Jam, one thing kept nagging me in the back of my mind. The performance was abysmal when there were more than a hundred enemies on the screen.

Since I don't have a lot of game dev experience, I made a major mistake which this update rectifies: COMPLEX COLLISION SHAPES!

Yes I made close to pixel perfect collision shapes for the player cookie and the monsters. But that leads to a lot of computing. So I simplified the collision shapes. A lot!

And also fixed some bugs, that were not really visible in normal gamplay :)