Under Falling Skies is a great solo game with a campaign and one off games. Think if Space Invaders and boards games had a baby.

https://www.amazon.com/Czech-Games-Under-Falling-Skies/dp/B08HGS1QYT/ref=sr_1_1?crid=2JOORZU9DM9RF&keywords=under+falling+skies&qid=1656437861&sprefix=under+falling+skie%2Caps%2C79&sr=8-1