Really cool game! Although it took me awhile to figure out how to jump to the last coin, I had a blast! I really like the intuitive tutorial on the mechanics. Just a formality: z maps to y on a German keyboard - which really worked well with your other controls

Very cool concept, shame that it didn't have more levels! I think, as another commenter pointed out, the main issue with this was the enemies still being collidable on death. I enjoyed trying to get my time down, so this could be a good game with that bug fixed and more levels.
 

Very polished lookin', only issue that stuck out to me was that even when enemy was already 'dying' it could collide with the player and destroy the mult.

Nice job tho