Cool little game!
The art could use a bit of polish though.
Also, the music box song at the beginning changes pitch as you move faster or slower, i don't know if that's intentional but it gives the game a super creepy vibe. This is probably due to the Doppler effects being activated on the audio source.
Also I think the respawn should take less time. On challenging spiky areas it's kind of frustrating to have to try again multiple times and having to wait for the respawn animation.