For a jam this is actually a pretty decent game you accomplished the main goals of having a working game loop that someone can play from start to finish. I like the blow up animations where they turn to small blocks. The concept is simple but can be quite fun. Overall this is a great start

It is a simple game, and that is not a bad thing. It is an average time waster. I would add another way of changing colors thought. Allowing you to circle colors with the scroll wheel or the right mouse button would add something to the experience.