Shoot First
Described as an "co-op action roguelike" game, Shoot First, is a mix of Roguelike elements, retro graphics and RPG systems. As weird as this combination may sound, it's actually works great. Of course, instead of the typical sword and shield in RPG systems, you will be packing an automatic instead.
Developed by Teknopants, the game allows you to play single or cooperative missions. Go on two player mode and fight off monsters, quests, score some loot and save a couple of trapped people in the process. This game certainly knows how to fuse weird elements together and make it work.
If you play the game, expect a lot of dungeon crawling and monster killing goodness coming your way.