Nice game! Good game design and I really like the psychedelic feeling (the checkerboard background, warping music, and the fish-eye effect at the end of each level). 2 main things I noticed:
1) Sometimes, when I would press 2 buttons right after each other, the level would visibly turn black but I would still be able to move through it. However, this fixes itself if I exit the black and hit a key 2 more times. I think it's just an issue with the sync between the collision code and the visuals.
2) If you go out into the middle of a field of white and start holding down 2 diagonal keys starting on the same frame, it counts as 2 inputs and immediately switches back to white and doesn't kill you, letting you change direction in the middle of a white object if you're skilled enough (speedrun strat? lol)