Three ideas, all generally small, so I might do all of them!
Summer Slasher Movie, with the players trying to survive and discover the truth/a way to escape.
Battle Royale, where even if you die you can carry on as a different character.
Space Outlaws just trying to do jobs and get by.
I've also created various minor mechanics for these ideas, and I'll bundle those together as well and try to release that first so other people can use them if they want!