Ok I just beat it no badge.
The boss is easy once you figure it out.
To beat the boss dont jump full height
but avoid his attacks until he turns pink
then jump (NOT FULL HEIGHT) and land on his head. do that three times and you win.
Daz is right. It gets really repetetive. BUT, I do look forward to seeing a new thing-thing arena. Just so you know this game runs extremely slow I dont know if that is intentional but have an optional bullet-time mode, and an overclock mode.
Best Game Ever! 4/5 in my opinion (I did rate 5/5 though :)), No game is perfect BUT this gets very repetitive, still fun. But you should increase the inventory size.