Gordy and the Monster Moon by Twinbeard

Gordy and the Monster Moon is a bite-sized, Halloween-themed Zelda-like about a pumpkin astronaut going on spooky adventures.

• Explore the strange and varied biomes of the Monster Moon!
• Find upgrades and unlock shortcuts to help you explore even better!
• Defend yourself from monsters with a cobweb you found on the ground.
• Ask dad for help if you get stuck!
• What is in Lander B?

If you already have Pico-8 you can download the cartridge or the source code for free under the section labeled “download demo.” Despite the label, these are the full game, not demos.