Wow that's super polished! I don't understand how this has so few ratings. I love the mechanic and it was super fun :D
Here are a few things I noticed:
- The controls were a bit difficult to grasp for me, I am more used to the arrow keys and Z/X in 2D platformers.
- There's a bug at the end of the HTML version, I can't see the text at the end completely.
- I noticed your money doesn't disappear when you die, so you can farm the coins indefinitely, was that intended?
Other than that the game is great! I hope you expand on it, it could become a pretty fun platformer.