I liked this game a lot! The art looks amazing and very unique. The controls feel good an polished.
I also like, how the game doesn't let you start from the beginning when you die. This made it less frustrating but I still felt, like I mastered the game and defeated the boss after I managed to survive the final round of the laser in two directions plus color all around.
What I think, could be improved:
The part in the beginning took almost to long. If I didn't know something to fight would be coming, I would have gotten boared.
Also some anticipation from the boss would have been nice. In the end I managed to learn his behavior and his patterns but the lack of clearly visible anticipation made this rather difficult.
All in all, a great submission!
(Also: The thumbnail could have been chosen a bit better. It doesn't do the awesome graphics of the game justice.)