I got to the end, but the pickaxe section certainly was a bit finicky. In general, I'd take a look at how you're managing object storage and picking up (sometimes they'd... ignore my key presses, or something?), but the game was really nice. The atmosphere built slowly and only really ramped up when I was least anticipating something to really spook me.
Of course, I couldn't help but turn around in real life. Nice sounds, fittingly small puzzles; good work all around.