Okay this color mechanic was really clever! As some one who draws and thinks about color a lot, I had way too much fun with that. I think for a game is rather pleasant to play in a strange sort of Zen way. I found myself just really enjoying the experience, and not getting stressed like I usually do with this type of game. The music probably helped with that, but what I think it was also just me messing with the blocks and getting the nice colors and then hearing that really nice shattering sound. I think you did a great job, made even more impressive by how new you are to Unity.
Great work and thank you for sharing!
PS - my highs core was 240.