Loving this so far, Badspot. I think I found a glitch, but it is nearly impossible to replicate so I can't really confirm. I landed on a vertically moving platform and at that exact moment I landed on a Bullet Bill, too. I bounced off the Bullet Bill and fell straight through the moving platform.
Like I said, incredibly unlikely circumstances make this very difficult to replicate. That also means it's probably not too high on your priorities list, but just thought I'd share. Keep up the good work!
