Super nice game !!!
I died during the boss, I think I almost got it ! I'm super bad with color mixing and it still felt good.
direction sensibility felt weird/too fast at first but I got used to it and it was sometimes useful, sometimes not.
Also be careful about accessibility, I don't think the game explains the control so much ? At least I didn't see and had to gess: arrows were easy to get.
WASD: be careful cause not everybody's a gamer and know it's gonna be useful keys. Also I'm playing on qwerty keyboard and I had to change during game (for this you can just add a W/Z A/Q S D controls by the way ! easy trick that helps you reach more players)
and up/down arrows I had to guess too and it took me a bit of time. But I didn't get hurt because of it so that's alright (don't hesitate to "pause" the game while the player is figuring the keys right)
The difficulty curve felt super nice, I always felt like the game was challenging me but it always felt possible to finish it without dyging (I ended up dying but meh i'm bad with colors as i said :D )
I love the fact that without knowing the colors mixing rules super good you can quickly figure it out by trying. Great level design for that, you never trick the player by needing a color for an enemy but two other for another enemy. It's always "two colors for 3 enemies" and it feels good. Especially during the boss fight.
(Oh and by the way be careful about "color based gameplay", they're alright but people with eye-problems can have difficulties playing them )
I loved it anyway, the music was with me all along and helped me. Couldn't think of anything else but the game during those 3 minutes.
Looking forward for your next games.