I like how this plays as both a platformer and a puzzle game although it's a little unforgiving. For example if you mistime a double-jump at any point you basically need to restart the level. However, I suppose if you respawned enemies the puzzle aspect of the game would be lost.
I managed to beat the first level with the full 20 coins (after a few tries) but the second level got the better of me.
The door opening effect is cool too, and I laughed at the intro when the "salesman" cursed me into becoming a hat.