Paperbag Dungeon: Mind the Mushrooms

From BoardGameGeek:

Mind the Mushrooms is an 18 card solitaire, tile-laying dungeon builder, with elements of "tower defense," hidden puzzles, and resource management. Each turn you will choose a card to add to your dungeon. Build carefully because one wrong tunnel could let in monsters that have the ability to dig through walls, open doors and crash your Dungeon Gate. MTM can be combined with the original Paperbag Dungeon. -description from the designer