I'm only up to red but am finding the idea and simplicity of the game really good.
one thing i wanted to mention is that when I have my white squares filling and auto-collecting very fast it moves all of the UI side to side ( I believe because the multipliers popping up and disappearing) and this for me is just that tiny bit annoying . if this could be fixed I think that the game would feel so much less straining on eyes and be that much more enjoyable.
Great work on the game !!!