The amount of grinding makes this game play more as work than fun. It seems like a blatant cash grab. Make the grind ridiculous but allow people to pay to pass it. Disappointing because I loved the first 2.
The first two were so great. I was so excited when I saw this one on the front page. It's meh. Really easy. Too short. Making it a defense game was a bad choice. Finished it in about 20 minutes.