Cool little game, but a though one. It´s very difficult to survive more than 30 seconds… In the positive side, I like a lot the simplicity and visual design of the game, and the solid gameplay.
I wrote some suggestions, and I could add one more: using the UP arrow to offer a little air brake with an energy bar (resistance, balance… whatever). This could help in some parts (when there are a lot of bats with colors that don’t match) with a score malus, or something.
Also, a quick restart button, as Anagh said! It´s a great project. I want to see the next advance!! ^^