I like this game, as simple as it is. The game has a great atmosphere, and once you get into it, you can start chaining together cards. It seems at first that you can just press random buttons in a specific order and win, but you have to be a little more strategic. If you had been able to implement the puzzle system, I'm sure it would have been awesome!
Only major bug I ran into was that your health doesn't reset after you die, so you basically just get spawn killed after that and have to refresh the game.