Lovely game! One thing I missed is the SaniTy (st) meter representing sanity, I feel like both Oxygen and Sanity could use a more descriptive icon. The fact that you need to herd your astronauts into the moonbase to reduce their space madness is also not explained in game (the only game mechanic I needed to read the description for)
Otherwise it's a solid, if short, game with a pretty neat conclusion! (Wish there was more to the ending as well - perhaps a glimpse where they went? ;) I also had a window of time to send multiple of them! I'm curious if that's intentional.)