Love the relation to the theme and the graphics and sound are fantastic. In regards to gameplay, while I think it's a neat idea, the gameplay itself has a couple of design issues i think. Since it's just rock paper scissors and you already know what your opponent picked, it's just a matter of choosing the right one as fast as you can. Not only that, but if the opponent has a bunch of varied troops, you could spend an entire round fixing up one row only to get one guy to go past. In a way, that makes the strategy of the game to focus on the rows where there are identical troops in a row since you can do the most damage with the minimum amount of changes, though ultimately I'm just not as big a fan of it.
The cards add in a cool twist to gameplay, but ultimately I think the rounds might just be a bit too long, especially in the tutorial when you're just starting to learn how to play. As I mentioned earlier though, the graphics and sound design are amazing and the opening cutscene is wonderful. Great work!