What are some alternatives?
When comparing Royal Booty Quest and Slay the Spire, you can also consider the following products
Guild of Dungeoneering - Build a dungeon from playing cards in this turn-based dungeon crawler.
SteamWorld Quest: Hand of Gilgamech - A turn-based role-playing game and deck-building game hybrid
Card Crawl - Solitaire, care game of dungeon crawling.
Blood Card - Adventure card game combining elements of roguelike and deckbuilding.
Night of the Full Moon - Mild strategy deck-building card game based on the tale of Little Red Riding Hood.
Children of Zodiarcs - Story-driven, tactical RPG