I like the black contrasted with the lights.
I do not like how difficult some of the platforming is...
Your game really wants to be a slow thoughtful experience, but the platforming on the last level was just frustrating, which pulled me out of the experience because I was mad instead of somber.
So my advice:
-Slow down the speed of the enemies and your character.
-Get rid of the momentum, you slide a bit when I tried to stop, and I died a couple times because of it.
-The text should either stay on screen once it's been triggered, or go away permanently when you walk past it. In one level I was backing up to line myself up for a jump, and the text was flashing in and out, which was very distracting. Maybe just giving the text a fade in/out would solve that problem so it doesn't flash so strongly.
Overall,
I liked it, and with some difficulty tweaks you'll have a lot more players walking away with that somber experience your game really wants them to have.
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P.S.
You commented on my games art, but we basically have the same character :P