There's this really fun game on itch.io called Forward! You basically choose between two cards every round. Some cards are monsters; other cards are items that increase your health, gold, or attack power; a few cards are special events or wild cards. Ring of Pain is basically Forward! with a surrealist horror vibe, a few added elements, and a $20 price tag. It's another game that would be fun for short mobile sessions, but honestly, I don't see the point in buying it since you can play Forward! for free.