It's a fun little small game, the color changing mechanic a la Ikaruga is pretty cool. Very clean look. I talk about this in my playthrough video but it'd be nice if your cursor changed color as well as the player. At the moment the game seems a little thin, but if you really dig down in the color changing mechanic I think there's a lot of stuff you could add. I'm just spitballing but maybe something where you have momentary invincibility (less than 0.05s) against the color you switched from? And as others have brought up the transition between easy enemy spawn rates to tough to deal with is real quick.