Very, very nice horror experience so far.
I love this kind of games (or quests in games) where you are to piece together what had happened from fragments of letters, diary logs and other tidbits left behind by other unfortunate individuals, so this game is exactly my kinda jam.
Your writing is very evocative and sucked me right in, and I also loved the little details like the messages in the protagonist's inbox at the beginning of the game, or the past mission logs.
It didn't even feel like the sound effects were missing - it takes place in space, after all, not much noise out there. The only thing I personally could imagine would add to it a bit would be some kind of ambient "ship sounds" or alerts for the communication device.
The biggest problem I have with this game, though, is that I am an absolute lore-whore, and I just NEED to know more about the LORE. The crew! The races! The CATS!
ANYWAY. I enjoyed this game very much, and I look forward to more endings. Thank you for sharing this with us!