Brute Fort

From BoardGameGeek:

Brute Fort is an 18 card dungeon delving game for a single player. It takes 10-15 minutes to play. In this game, your courageous (or foolish) heroes venture into the shadowy recesses of the fort. Inside they'll discover a jumble of fearsome foes and alluring loot. Over the course of play you'll place cards from your hand to build up the explored rooms of the cursed building. Brute Fort takes the familiar format of card duelling games, like Magic The Gathering and Marvel Snap, and turns it into a lightweight solo experience. Instead of battling against an opponent, this game sees the player battling the eponymous fort itself, racing to reach the top and come out on top. -description from the designer