Really satisfying animation when you fill a lot of squares at once. I made it through the whole game and the animations and effects are very satisfying :)
The mechanic gets a little repetitive though so maybe some squares would only be able to take one type of color and you would have to switch what color you're using to fill them!
Very well done, also the song is a little repetitive so you could make the loop longer. Other than that, Great smooth camera movement and a great game over all! Good way to keep it simple.