Fun, but....

This is a fun game, I will admit.
But unfortunately it doesnt give me any reason to continue playing... My issues are as follows:
• You have all turrets from the outset (restricted based on stage) so you dont feel like you are building your power base up by progressing through the maps. (stage progress is also absent as all stages are unlocked from the first time you load the game)
• The characters you can choose from, while upgradable during a stage, reset once the stage is done, so whether you win or lose, either way, you feel like all that time was wasted because the game gives you nothing to carry from it.
• The game offers a total of 6 characters, 4 already unlocked. The additional characters can be unlocked (read: Purchased) by downloading every other app this company has ever made... Can we say "cheap, underhanded gimmick"? Unfortunately, it doesnt matter as the characters you can select from are all the same! As your character levels up, your weapon evolves from short blade melee to long blade melee, then to short ranged firearm and so on, but aside from appearance, there is no difference between any of the characters!
If one character specialized in firearms, another in one on one melee, another in multiple on one melee, another in boosting the strength of turrets etc. you would have additional variations to gameplay style (read: tactics)
• For this game, admittedly, this is a minor issue, but the graphical design could REALLY have been better. The longer you look at an individual aspect of the game the more you realize how crap it looks. It really doesnt take much to have good art made for backgrounds, just go to DeviantArt and commission a skilled artist. $50 later and your game will have more to appreciate and consistently, many more sales.

Kdbolitho about Zombie Attack! Second Wave XL, v2.1.0