Interesting concept, if a little rough around the edges. The main game mechanic of making the mosaic takes some practice and trial-and-error, but you eventually get some progress when you try. I could see this being nice even in an expanded form with some story and scrolling levels, maybe. If you're interested, you could also enter our contest, the Game Development World Championship!
Hey, thanks for giving it a try! This is just a prototype for fun. I'll participate in it with my working project Signal Decay when it's ready :) http://signaldecaygame.com