It has its basic lawn defense gameplay, whereby you plant plants to shoot back the invading zombies. You need to manage sunflowers for resources and deciding how many sunflowers to plant is crucial to your home defense. Even more robust is the number of flowers available to use, there is well over 50. Each person will find their own favorite strategies. Personally I prefer to use the kernel launcher, with starfruits and spikey traps. But the options available are incredibly diverse and profound. The options are often limited more by your mind than anything else.
Needless to say, the game costs 10 bucks, is awesome, so just get it. Worst case scenario, you dont like it and you are only out $10.
I'll end this post by saying that the new Batman game looks pretty fun, and have my fingers crossed. Also Wolverine looks fun, but not $70 of fun. $30 and I'm sold.