"Just Defense" Is A Simple Top View Defense Game.You can upgrade weapons, build turrets and use skills.
Also you can upgrade turrets.
There are Normal 45 rounds and 2 Boss rounds.
Upgrade Turrets
Class Up Turrets
Upgrade Hero and Buy Weapon
Use Skills
Also it has android version
Link : JUST DEFENSE
https://play.google.com/store/apps/details?id=com.BlueFogs.JustDefense