Addictive and Frustrating (but not necessarily for the expected reasons)

Early on it feels like a breeze, but its difficulty does pickup notably. I am currently hitting a wall in which I need gems to progress, but they dont drop often enough for me to play without paying. I wish there were mini-games or sidequest activities where I could gather gems wihout paying for them. Also, I have noticed that the price for gems seems markedly high compared to other freemium games, especially if youre interested in the booster packs which are very costly. The zombie sister game--which is unlocked early on--is incredibly hard compared to the primary game, and lack the bonus levels which provide ample item drops. I would like to play more, but know that without dropping $20 or more, I probably have no more than a week left of occasional play.

C A Phillips about Samurai vs Zombies Defense