So, I know that I don't know much about this kind of game. I didn't know that Gardens and Graveyards is a base-capture mode. After completing one as Plants, I still don't understand how Zombies capture the garden; is it damage to the garden, or occupying its central space?
I absolutely love the Topps-styled "bubblegum cards" for unlocks. This is just hammering on one of my weak spots: nostalgic, random, collectible cards, and I'm surprised there isn't already a IAP option for purchasing more coins. I'm happy there isn't one; I like that (so far) it's a method for unlocking Player Classes beyond the basic ones. Though on the other hand I wish it were a bit more random, and that cards had some method for trading them. I mean, the Player Class stickers are never going to give me the same sticker, right? It will increment the sticker to include the next unlockable.
There are some peeps who have been playing this A LOT, apparently. I mean, I suck and all that, but there are already players at Level 30, with completely customized in-game characters no matter what Class they're playing, whereas I've received all of three items total.