Hi,
I don't know the mechanics so. can't comment directly - though I feel I could easily transpose. those to Traveller or Airtight or a YZE game.
The ending could do with a little more. The atmosphere is breathable which means it's likely there's food. This isn't the end of the mission; it's the beginning of THE COLONY! I'd be excited to play that option? I'd probably be the only PC wanting to stay!