Nice interpretation of the theme. I really like the protagonist model too. The absence of other characters makes it feel quite bleak, and you’re left with a lot of time to consider your mistakes when falling. I mean this in a good way, though: it adds atmosphere and makes it an interesting experience.
You might choose to add some more recognisable landmarks so people are able to keep track of their progress more easily. But maybe that was an intentional decision, as it contributes to the feel of the game.