Like many, I see very little strategy, in the early game. Maybe it gets intriguing later, but I'm just gonna spam my way to the badge. BIG POINT: which it took me way too long to figure out - you can attack with hearts if one of your cards glows green. Click on your green edged card and your banked hearts will attack just like skulls.
Got the Medium badge by going Ameican, very easy. Never built anything but farms and barracks. Hired only swordsmen and peasants. Went the Chicken route, saved the scroll until the final battle. Easy peasy.
It's ok. I generally like these games, but a bunch of these fan fic levels are a lot of luck/randomness. I passed all 30 to get the badge, but I prefer clever design over perfect timing, as many have said.
I believe this gave birth to many similar games, but this one seems to run the smoothest with the best controls. Only fault is that it's too short. Great game.