Good, but challenging
This game is fun and easy at the beginning, but does get harder and you eventually end up with destroyed towers and slaughtered infantry.
Once far enough in the game I realized that the melee guys all died within seconds.
Honestly I didn't see a dramatic change when you upgrade your towers.... and you misspelled the word poison. I expected a better HUD for upgrading and purchasing units but that doesn't effect the game play because of the pause options.
This version is easier and more addicting than the first so it's only fair that you get a good score =) 4/5 9/10