Back when I was a kid, my dad somehow found these shareware games by Cheesy Software, and they’ve been on every computer I’ve owned since. The ones I played most were Cheesy Invaders and Megapede, but there are a few others, including a remake of Scorched Earth!
They’re quite small games, so if they end up being a podcast topic, I reckon have multiple in one episode.
Here’s a link: http://cheesysoftware.net/cheesy/index.html
I also have an earlier version of Cheesy Invaders. I prefer this version. https://www.dropbox.com/s/q6y3mgyoz3f9rz8/INV07C.zip?dl=0
Another leaderboard game, perhaps?