Definitely A Big Bum Moment 

4 Bumperdumpers/ 7 Rimperstimpers

Its an interesting game, took me a bit to get to 60, but proved a fun little challenge. Not that bad considering it was written in python. All in all, I had fun, so its good enough for me.

I WON :D I didn't know that I could loop around the map by going into the side of the screen lol but the difficulty rise was so well balanced, great job!!