Quite a vibey game. The art is well integrated. And the music goes very well with flying around (It also goes great with looking up Cecilia's skirt for 80% of the game!)
I think as far as design feedback goes. I wasn't quite sure if this was a bug, but the Red Cecilia seems to be overpowered, as she has 7000+ energy while the others have way less. The numbers seem so random that I am convinced there must be an inside joke going on that is floating over my head.
Anyways, I ended up flying as Red Cecilia most of the time. While the color match bonuses are nice, the convenience of Red Cecilia's huge energy stockpile made it so I preferred to just stay with one color and collect everything.
I also think that the game is maybe a bit too long. Rounding up 300 collectibles can get a bit tedius after a bit, especially when there are only a few remaining. I think a slightly shorter game can help incentivize things like going for high scores or top times.