huh, I was expecting not to like this, as I'm not generally big on puzzle games. But, it's really good fun
the difficulty curve is just right- you did a really good job of easing up the difficulty, and the levels are a good length (shortish) so that if any turn out to be too easy or too hard they don't stick out much and spoil the experience.
I played through a bunch of levels last night and just kept going through them. I eventually stopped on the puzzle bobble character, it was late and it had me stumped
no crits really, I think you've got a great product! I guess your main challenge will be getting people like me to try it (who think they might not enjoy it) and get them hooked