Awesome setting. I'm realizing the "fantasy" of a game needs some marketable appeal, even for a game jam. I'd say your cover art and title clearly communicates: horror set in some collapsed mine.
Don't you just hate it when you get lost in the endless tunnels of your own strip mine.
The retro style pixelation affects (and similar) look fantastic as far as homages go, but do get a bit tiresome after a while. The models are great, and the level design is too. If I stand still at like any point in the game, it honestly looks like some retro recolored photo of a realife mine.
I'm happy you added sprinting, but the tunnels were still quite long. I mentioned the level design, but honestly, the outside area was so detailed.
The sprinting SFX were a bit repetitive, but the general ambience and such sounded quite nice. Anyway, I'm glad my pockets were big enough to fit all those people.
Cool submission.