Finished the game on my 4th try, the level is small but takes a bit of time to figure out how to collect all the keys. The audio and visuals are amazing, but the best thing truly was the level design. The way you interpreted the theme is unique, and perfectly matches with the level design. I love that there isn't a tutorial thing, because the game teaches you what to do by playing, when I first realized I could move and use my dead body was super satisfying, because I learned it myself without any tutorials.
One bug I found was that my dead body went below the ground when I was in the scene with lots of spikes and vines, right below the first drop. So I decided not to die there anymore :D Anyways, this game deserves to have more levels, the puzzles are amazing and aren't too complex. Great job!