Congratulations on releasing your first complete Web game!
I had a fun time playing (although I am admittedly not very good at these kinds of games). I like the graphics (the "ghost" effect trailing behind you is quite satisfying to watch) and the power-ups. The sound effects fit the aesthetic perfectly. How did you create them?
My only complaint would be that the frame-rate appears to dip every now and again. It's nothing major (lowest I saw was a drop to 52 frames instead of 60) and it didn't make the game unplayable, but it was noticeable and took me out of the experience the few times it happened.
All in all, great game!