Someone submitted runs for Easy on SMS and NES. Not at all optimized, but impressive anyone even got through it given the platform.
Sorry, I've recently moved, so I was AWOL there for a bit. I'm not sure it's actually possible to do a 100% speedrun of the game. I realize glitches allow some of the non-100% levels to happen, but is it actually possible to 100% all 120 levels?