How much "video game"? My first was a guess the number game with knights jousting, you got left/right/up/down hints for the point on his shield. This was on TRS-80 Model I, summer 1979.

Actually moving "sprites" (character graphics blocks) around the screen, Jetfire was my space shooter not QUITE like Defender because I had no ground, late 1980?

No copies of either survive, they would've been on cassettes lost/wiped long ago, a few copies of Jetfire were made for others.

I've done a lot more since, of course.