Nice and simple puzzle game! I used to play this type of puzzle when I was growing up haha Some feedback would be maybe tweaking some of the colors because some of them looks closely similar so it's hard to tell which tile it belongs to. Also, maybe change or add some new mechanics after a few levels because 20 levels of doing the same thing gets pretty stale fast, maybe doing 10 was enough if no mechanics were introduced. I found myself stopping around the 13th level because I already know the gameplay. I didn't get to stay to see the ending. But great game overall!