Space Age: A Cosmic Adventure is much more adventure than RPG, but it had a good storyline with plenty of puzzles and mysteries. There are some tactics and strategy required, which nudges it into RPG territory.
“Space Age is a game of cosmic adventure. Set in the retro-futuristic sci-fi world of 1976, it follows a small but determined band of intergalactic explorers who land on a seemingly uninhabited planet, Kepler-16. They soon discover there’s something both strange and familiar about this alien place… And what happens next is a clash of old and new, a battle of past mistakes and future fallout.”
It’s an interesting choice if you’re looking for something space themed and/or a bit different. You can also download the soundtrack.