This game is pretty hard! Great for people who want a logic challenge.
Minor things I might tweak would be making different shapes be different colors and/or when you're touching a shape make all of those shapes glow or something to increase visibility, and adding more varieties of music.
Not sure if this is just a problem on my end or if an update to the game was published recently -- when I started playing last night I finished a bunch of levels but it didn't save my progress when I reloaded the page this morning, but just now I played one level and reloaded the page and my progress was saved. Also at one point the reset button reset most but not all of my moves on a level.