A card game isn't the first thing I would think of when you think of "Holes," so when your game loaded up, I was surprised. I think your idea is really creative, and is helped with the pixel graphics. I also like the Super Mario Bros.-esc. progression in the world map. The things I don't like are the lack of variety in cards, too many duplicates. The game also doesn't present too much of a challenge. There are so many damage cards that spawn, that you don't have to worry about much else. Also, I think there could be more "Holes" on the visual side. I guess the damage cards make the monster fall into a hole? Visualize that in the game. Very creative game, good job.