Moonsailors (unrelated to Takeuchi's manga) is a 10 page rpg about exploring the galaxy. It's played with coins, printable tiles, index cards, and a group.
Everyone plays and everyone GMs, and the cast starts (and stays) seriously scattered across the gameboard, so it's somewhat rare for player characters to meet.
Players play by interacting with locations according to their own motivations, and then moving on. GMs play by asking questions that shape those interactions.
Despite being a group game, there's a distinctly lonely-but-warm feel to it.
It's also very much a game where you get out of it what you bring to it.
If you like telling a character-specific story in small beats over a long period of time, and if you like helping other people to do the same, I think you'll really enjoy this. Alternately, I think it could be played just fine with a single character and different people taking turns to play them, ala Bleak Spirit, so if you like atmospheric storytelling this might also be a good game for that.