I found this game to be very, very engaging. Sometimes, dragging cards onto monsters was difficult and they wouldn't lock on right. Also, a problem I noticed with later levels is that when there's a ton of monsters on the screen and you have to use all of your cards, you could run out and just be waiting for the redraw timer to decrease, which was frustrating. Overall, very, very well done and I could see myself playing a full release of this game!