Not bad
Pretty fun, kept me amused for ten minutes. After a while it does get repetitive, but you did a good job on this and the various effects were good brain testers.
Only thing that I didn't notice was a difficulty curve. I mean, power ups built up, but it went at the same speed (as far as I could tell) with the same frequency of block falls (as far as I can tell).
But like I said, good job, good music, great game! Well done.