Dungeon Scavenger is a super stripped down 1v1 dungeon crawler that can be completed in a ~5 hours. You click around the dungeon on a 2D map, get some choose-one-of-3-outcomes random events, open some trapped chests or fight some monsters (but only one at a time). There's a bunch of classes to choose from, giving a couple of active spells and some passives each. Everyone can tame monsters by using consumable scrolls, which is nice little feature, I suppose.

You upgrade your town each time you win, there's extra floors from the DLC, and multiple difficulty levels, but there's just not quite enough going on to justify more than the 5 hours. It's not a great game on any level, but I enjoyed my afternoon with it well enough.