Pretty awesome game!
I gotta say though, I feel like a dirtbag - I've been lecturing the other crew members about staying positive and cleaning up the rust, while I haven't even attempted once to shrub a single speck of rust and just went back to sleep.
It's fun that our games landed at a somewhat similar art style, although if you'd want my advice in regards to shader work, I would recommend converting the rgb colors to hsv via the colorspace conversion node, apply the posterization to just the v component before converting them back. Simply posterizing the rgb values, like I assume you are doing right now leads to somewhat garish and unnatural gradients, which of course could be by design, but doing it the way I suggested gives you more control over the color, while keeping the cell shaded effect.
The atmosphere and writing are great.
I had a difficult start with the game as I didn't know what to do initially and my first cycle was bumping into everything before finally getting the prompts done. Of course I only had to figure this out once, but it still wasn't enjoyable and took a long time. In the same regard I also missed a lot of the dialogue in the first few cycles, as I didn't expect anyone elses display to change (I assumed I was playing all of the crew consecutively and not just one guy, so I only read the messages I left).
How you tackled the theme was great! And I agree with a lot of the other commenters, that this was pretty much the best application of decay and cosmic horror, I've seen this jam.
While I do think the smear on the life pod has potential to be iconic, I think you could easily improve the packaging of your page with better screenshots. Even on the title it would be more striking if you would show not only the smiley, but also the silhouette of the pod.
Because the game is a somewhat large download for a jam project, I think it's important to present it as best as you can - if the comments weren't as stellar, I don't think I would've given this project a chance.