I spend a nice time with your game. It's really good Arcanoids-like inspired game. And this aethtetics... omg I am a big fun of stuff like this.
So what about gameplay and gamedesign. You did a good job, everything feels smooth and nice. But you should show your content more early(for short games like gamejam ant etc). Game feels interesting in begining but with time player start to feel boring, and this brick effects, with multyballs should appear in this time to save player interest level.
Good job.