Cool little game. I had fun trying to collect potions in rhythm of the music (even when I know it is not really the point).
I don't know if its just me, but I felt little dizzy from the fast movement. Especially later in game when things get faster. Maybe it is the chessboard background or something.
Also it would be nice if the highscore was saved in cache so it won't reset when you refresh the page with game. But it is just a small thing.
Btw: The winged flask protagonist is super cute. :-)