really interesting concept! I managed to find all of the notes and I think I reached the ending (I got a success status and the input box stopped accepting inputs). I did have a tough time feeling like I was directing things, but I think that was part of the experience. I definitely agree that the scope seemed pretty ambitious, but I think you pulled it off pretty well to deliver a really compelling experience. The music fit the tone really well and by the end I was definitely feeling sympathy for the astronaut, which is a difficult thing to do for a gamejam game I think.
really solid entry. nice job :)