I'm utterly speechless. You made a great game. I truly loved it. From the stunning art to the amazing score.
I just have a couple of small complaints -
Although the dash is a neat feature, it feels very rigid. Even adding a trail, particles or some squishing could make it more juicy. Another small issue, the difficulty curve just seems to jump up at a certain point, but it might just be because I suck at video games.
Nether the less. I think if you polish your game some more, add a couple of extra levels/stages, you could probably publish it. Well Done! :)