Really polished game, very smooth and slick, with great music! - Interesting take on colour change bullet hell games, mixing it up with platformer elements!
I found it really difficult to play with keys even on casual (as I'm an old git!), as each function is generally needed with high reliability/timing accuracy...
...but guessing it would play beautifully with a gamepad, or perhaps if the whole game speed (character/projectiles, etc) could be cranked down a touch to cater for more sedate players... ;)
Good luck!