Would be nice if there's some indicator before light is going off/on like a slight flicker with sfx, especially there're some mechanic directly tied to that timing (the laser)
I love the stache guy, he's cute. I also enjoy the death screen being different based on what killed him, but a quick respawn would be nice to have, it's a bit tedious to move from wasd+space to mouse back and forth every time I make a bad jump. Double jump is sometimes a bit unresponsive?
But overall, very charming. Good job.