Very polished. The difficulty curve was not well handled to me and I feel like i was never threatened. Didn't see a lot of patterns and the levels became a bit repetitive. The soundtrack was very good and the game is very visually appealing.
Thanks a lot, I'm really happy with how most of the mechanics and visuals turned out and I'm glad you liked the game! As I've mentioned in previous comments, I completely agree with the difficulty curve being too easy and boring. It's something I'm going to address and fix in the future! =)