Soda Dungeon is a free simple casual RPG on Steam where you assemble a team of characters that explore a dungeon, fight monsters, and collect treasure, all while you act as their manager, buy new equipment for them, and upgrade the tavern to attract more adventurers. The graphics are in a retro DOS style and are quite charming.
Pirates! Gold is a fun little pirate adventure game originally designed by Sid Meier. This is the version for the Sega Genesis / Mega Drive.
Caves of Qud is a science fiction / fantasy rogue-like game new to Steam early access, and it’s available for all three major platforms. It specializes in using classic rogue-like graphics and interface design and deep gameplay. Checkout the video here.