I have no idea what your idea is, but to adapt your idea to the jam, you could
- add moon easter eggs that are hard to find and part of a hidden score factor i.e. miniatures of real-world space rockets
- make the game setting space or the moon.
- define difficulties with sci-fi terms i.e. rocket enthusiast (easy) / space agency (medium) / moonshot (hard)
- create a bonus level with a space theme
- name npc/entities after known astro/cosmo-nauts
- name entities/scenes after actual regions/craters of the moon
- name/show objects with 1960s technology themes i.e. retro computers vehicles clothes tools etc
I'm sure there are many other ways to give your idea a lunar vibe.