Thanks! And I'll look into the player movement; I can't reproduce it on my computer so I may have to try on the school's computers.

This game is harder than it looks lol. Very funny though. The right arrow key turning counter-clockwise seemed counterintuitive too me, and the terminal window got a bit busy when every created butterfly was announced to the player. I think this is because of the Butterfly's addedToWorld() function, but to be honest I can't quite tell what this does. Overall great job, keep up the good work!