I'm super impressed that you were able to do this in 48 hours. Game was fun. I played this on a mac, and it worked fine, except for a small lag at the beginning. Also, it wasn't obvious to me that the controls are to click on the card. I tried to use arrow keys, then I clicked on the cells with the mouse. Maybe the card could shake a bit to indicate that that's what you have to click. The game has potential. You should add more types of enemies.