The game feel is strong with this one. You took an existing game and amplified it with a twist or two. Gameplay was very fun and animations and execution pretty smooth. Well polished and self contained jam game.
I agree with everything others said, and I'll add that the game becomes hard a little too fast. 6 colors are hard to manage and over long time you end up with too many of them stacked. Bombs can clear it, but not that well. Just when I start feeling in control suddenly game speeds up and in a few mins I get doomed. :D Perhaps I should play it for longer to get better, but it's hard to plan ahead with that many (similar) colors.
Overall a great jam submission. Nice work. ;)