Okish setup, glooms expensive to replace, spikerocks way too forward for top two rows, spikerock replacement frequent ( not a good sign), and twin sunflower should not be in front. Ok though. IMO i think 4 cobs enough. Alternate wave cobbing, and very cheap to maintain, at least easier to maintain then replacing spikerock every giga/ zomboni wave, and more resistant to jack explosions.
I am a fans of plants vs zombies. I playing it since 2009. Until now this is my favorite game. :)