The Core of Darkness is a game about the shadow taking on a fight against the raging light.
This was a schoolproject! There might be a few performance issues when you get to a higher level (more enemies...), but it was made using Push Button Engine (PBE), which probably isn't the best choice for something like this. PBE uses box2D, making it all a bit heavy. Personally I would've written my own - lightweight - collision detection... but we had to use PBE.
(I also made the "music" myself)
I've put in the medals after the school deadline, to give it a little extra.
Mouse - move
MouseButton (hold) - send drops