An early game I made was called Asteroid Run. This game used a redefined character set and Graphics mode 0 to fill a screen with asteroids. Your ship moved up through the screen and you had to move it left/right to avoid asteroids while picking up satellites for points. You had a shield that allowed you to fly through an asteroid without dying.

I did a re-imagined version of Asteroid Run in Xojo as part of Hour of Code in 2017.

Asteroid Run is one of the many perks available to paid subscribers. With the Goto 10 Year-End Sale, you can save 20% on a paid yearly subscription to get access to disk images with Asteroid Run and many other things.

Here is the original writeup I did for the game: