Here from me:
1. hold down button, till power empty (just don't move), then release it. The sprite still in tornado state!
2. there's a floating spike. Is that what you want? or just a mistake?
3. some coin is impossible to collect. Is that what you want?
4. yeah like scarma said, first level is too dark.
5. when I finished the game, nothing happen. I though my browser not responding. Back to level select would be good.
that's all