Here is my first game I've made for PICO-8.
I've really enjoyed using PICO-8, and learned a lot!
The game "TRAVELER" has a basic game loop (without any win state) where you fly around in your spaceship, exploring a randomised area of the universe.
Shoot asteroids to find minerals.
Then you can start trading your loot at the planets you find.
PS: You can also play the game on itch.io where there's some more text about the game.