I recently played an amazing DOS game where you have your country and you can declare war or peace with other ones, and i really enjoyed it. Growing up one of my favorite DOS games was Gobliiins 3, such cool memories!
Not to be the hispter, but my fav. is a very niche game called "Het Yogo Yogo Spel", it's a promotional game for a drink in the Netherlands. for some reason i have such strong nostalgic feelings for it, i really loved playing it as a kid and even more as an adult because it reminds me of that time so much. and no, it's not an amazing platformer (not bad either) but man...