Not worth it

I’m not going to spend real cash on this game, so I guess I’ll never get rid of the quests that require gems or game coins to complete.
I’m spending the game coins on upgrades for my zombies, not throwing them at boosts or other one time assists.
It’s a fun game with funny graphics.
If it wasn’t for the horrible judgement calls while writing the quests, I’d both give it 5 stars and recommend it to my friends.
Last but not least, I would consider spending money on it, IF it seemed at all fair.
From what I’ve read, you’re paying players are extremely unhappy with their purchases. That’s a good enough reason not to throw money at you.
CheeseDeveloper’s featured review is a shining example of this.

Skynner McGee about Zombie Tsunami, v3.6.8