Things I liked: The concept for this game rocks! I had a lot of fun trying to figure out how to organize my grid so I wouldn't misclick and lose the game. I also found the simplistic artstyle enjoyable, and the feedback sounds were also on point.
Suggested Improvements (Just suggestions, feel free to ignore them): I personally had trouble get the sixth color, and I don't think it was my playing that was the reason. I found myself at 5 colors, then, for around 10 minutes or so, I was trying to get the sixth color, but it wasn't happening. This was in the same game, and I probably made a couple hundred clicks. I would probably go back in and make sure the game is beatable, not just in a few cases, but even in the "max" cases (im not sure what criteria unlocks the sixth color).
Overall great game! I'd love to see it released as a full release with a sound track, menu, and possibly even new mechanics. Great job!