It definitely has potential, and I like the concept. It was done fairly well for the amount of time that you had. I also really liked the secret passages, though I'm not sure if that was exactly intentional. The notes, while nice, were too linear it seemed, in the sense that when finding peoples' writings, I always found them in the order written by the crew member. (Ex. Capt. Log 1, Capt. Log 2, Julie 1, Capt. Log 3, Julie 2...)
As for the ending, I felt it fell short. Even though I searched the ship three or more times, I never did find the escape pod key; while I feel like that it might have been an intentional choice to have the player never find it, I was a bit disappointed that there wasn't any choice for the player to not go into the storage room. As for that, I feel it was cut very abruptly, though that could be due to more me not automatically opening the door after talking to command. Also, the way the player moves felt off to me, especially once you are able to use the anti-gravity device. The way the character moves vs. jumps feels very off balance in anti-grav, and the lack of suddenly floatation when turning it on was a small disappointment. The filter used to tell you are in anti-grav is also very jarring and doesn't work well in my opinion.
There was also a note on top of the nursery that I tried to get to for quite some time, I'm wondering if it is possible to get to? I also didn't understand the random bushes (like two) floating in between the ship. Another thing about the secret passages (if that is what they are) is the fact they don't make sense in terms of the vents of the ship.
Another thing missing, though it could be an intentional decision to exclude it, was a map, or some sort of sense to the placement of the rooms. Just a more technical thing I felt was missing.
The dialogue was fairly well written as well. I hope to see you either polish this game off or take the idea and create a different game based on this. I hope this was at least somewhat helpful for you.