If a player does not reach godtier but still manages to create their universe, does their lifespan remain the same or are they immortal? Because I keep getting super worried about Karkat but nobody ever talks about it.

It’s never mentioned whether players gain immortality or any addition to their lifespan upon winning the game.

It’s stated before Collide that Terezi isn’t immortal, but the trolls also didn’t technically get their prize so it’s unclear.