Very nice
Simple concept, very well executed. Cool music and nice design (even if you don't spend hours or days creating elaborate graphics) make a game so much more fun to play and that's definitely the case here (I wish more people would pay more attention to aesthetics in their games).
I thought the variation in the levels was impressive and it's clear that the game was well play-tested before release. Enjoyable enough to go back and practice to higher scores.
It made me miss my old sega a bit and Sonic the Hedgehog. Yes I'm old.
Nice work!