I like the environment and wall textures. However I think mixing the very crisp high res textures with the very blocky low res sprites does not match all to well but that is of course a matter of personal preference.
I had to restart quite often (which I dont mind) because I got stuck in a wall or even got out of the level, it is a common problem when just using single raycasts for collision detection.
You should turn the player towards the target when entering the dance phase, I had some occasions where was supposed to see the rhythm but was facing another direction leading to an lose.
Looking forward to a more bugfixed version!