Such a great entry! Loved this. Honestly this is such an awesome self-contained experience, that didn't outstay its welcome.
The art was absolutely beautiful and everything felt nice and consistent, I take my hat off to SandySketches for that. By the same expression of admiration to you, the level and systems design was also excellent for the size and scope of the game.
It is a very polished game and frankly I don't have anything bad to say at all. But as this is a jam I will at least try to give something I think could theoretically be better.
The sound mixing was a tad inconsistent on my headphones, I adjusted the volume a little in the beginning for the footsteps and music, then my eardrums were blown out for the rockfall / entrance collapse (I had the exact same issue in my own game in a particular moment). This might just be my setup, so take with a pinch of salt!
Secondly the narrative is lovely, but the writing I think could be even better (this is personal opinion only and doesn't affect my score one bit, so please absolutely disregard this if you don't agree!). I'm a big fan of 'show don't tell' and I prefer not being told something that I can already see or already know. Examples include the character's internal monologue pointing out the footprints or telling me that the view is beautiful -- you already showed me a beautiful view so you don't need to tell me.
There was a conversation a little later on which was an example of the "as you know" exposition trope, where the two characters were talking about something they both already would have known as crew members, it just felt a touch strained, but I promise I'm literally just nitpicking so I can give you some feedback!
Genuinely amazing entry, it's the type of game I aspire to make. Like the other commenters I would love a puzzle perhaps, and I think you can really flex those storytelling muscles with some environmental storytelling to supplement your narrative.
The cutscenes were gorgeous and it was a great way to end, very well done and I can't wait for the next one.