First off, the visuals are beautiful, and I would love a longer game with this art style.
(Reminds me of some DS game from a long time ago.)
The music was also really nice, especially in the last area.
The controls were hard to use at first because the character feels a bit floaty and sometimes unresponsive, specifically after dashing. (It feels a lot better once you get the long jump.)
But after playing for a while, it felt better, and I could pull off some cool moves.
The exploration was nice, and the shortcuts for backtracking were well placed.
The only bug I encountered was on the first screen to the left. If you jump over the little castle and try to change screens, you get stuck inside a wall. Fortunately, I managed to get out.