Chasing the Sunset is a West Marches-style exploration game using Fellowship 2nd Edition‘s Horizon rules.
The party: Buckle the Beast/Heart of Earth, Stella the Halfling/Hunter
Last time, the Fellowship turned the Moon into a death ray and attacked the palace at Vieport and Petra’s giant robot spider a royal ship visiting the Empire, possibly starting several wars. They left the Moon with upgraded security, so they (and anyone else who finds the planetary teleporter) can’t return. This time, they go to The Empire to make sure Petra is dead.