Really satisfying to move around and push stuff, art is nice and succinct. But, when I found the "R" key to restart, the background music started doubling up and giving me a headache sadly so I couldn't play for too long. Otherwise, very cool idea!
Oh, I'm dumb! Were you restarting the first level? If so, the game is making two AudioSources in DoNotDestroy which plays two instances of the music until the game is refreshed. Sorry for the inconvenience, I'll remember this in the future.
