An excellent game all around.
That audio! The eerie synths and decimated clicks and groans of a derelict space ship are so good. The 1-bit art and crawling speed also snap together perfectly toward the overall vibe. There's a bit of a gameplay challenge here that I'm not sure is entirely solved: how do you keep things tense and lonely while maintaining the pace? I felt like the time taken to walk each tile became more and more noticeable as time went on. I don't think I have a solution for this that doesn't clash with the overall atmosphere in some way. Something to think about.
On the risk side of gameplay, the dice-based approach works well. There is a gradual descent into danger as you go deeper and deeper into the ship, chipping away at your oxygen. There is also a similar gamble for exploring more rooms while out of ammo. The odds are you'll run into these situations many times by the time you're seeing the relevant relief upgrades. This really helps to make the choices matter.
Overall great experience. Excellent work!