When I was. Small child in the early 90s, my dad was a network engineer and he setup our family computer with DOS and lots of games. I don't remember all of them but I do remember the following:
- Various arcade games that began running too fast to play after he upgraded the processor
- Commander Keen
- After Dark, which wasn't really a game so much as a cool and highly adjustable screen saver. But for some reason me and my siblings spent many hours playing this "game".
Anyway, I guess Commander Keen is my only real suggestion here and I do believe it's a great game. Just wish I could remember some other games he had installed on the DOS system for us that weren't baby games like Mickey's ABCs and 123s.