I played through the game and ended up at the screen when it faded to black and there was text and a smile at the bottom. Overall, I think the gloomy atmosphere was done well! The dark environment and music worked well together.
The game had room for polish but you did mention not finishing the game so that's fine. I think what you had now could definitely be expanded into a full game if you gave it more time.
Anyhow, kudos for submitting the game even if it was incomplete. Making games is SUPER tough, so even just submitting a work in progress is still a great thing!