For everything that is good, please, please, please don't forget to keep fire and ice resist items. They are 100% necessary at the later levels with the ice damage chargers and fire spitting fighters. DON'T WASTE TIME LIKE I DID
rushing tophat costume then rushing the last weapon made the game insanely easy. it took two tries to get the impossible badge. 4/5 expected a more difficult sequel.
Got an infinite loop this way:
1. Get all three valves open at level one
2. Place a spring at the center
3. Get in the middle of the spring and left wall
4. Keep smashing until a turtle falls into the loop
I'm not sure if this is infinite, but it gave me a 10,000 combo anyways.