There seems to be an issue with the music as it is clipping in the later half of the song.
Camera feels sluggish, it would be better if it were more responsive to your movement. Otherwise a very short platformer.
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I think that might have been a neat effect. I noticed that too, but when I went back to the left (I couldn't figure out what to do past that platform), I noticed the music got better, and then when I went to the right again it clipped again. I think there may have been some gradual and subtle scripted distortion to the music as you approached the mystery there.