Phenomenal game! I like how you combined RPG / deck building mechanics with breakout. Made it to round 7 with 397 enemies killed.
All round, I love it. It's a great start and I think it's got a lot of potential. The visuals are swell, the music is oddly fitting, and the gameplay seems fairly well balanced. If I were to criticize anything about it, I might add a way to differentiate between which balls on the screen of the same type - are which on your spell bar. Maybe a small number next to each one? Or a slightly different brightness to the color?