Exciting and prolonged sessions.
Beta to be released soon.
If you complete the level with all your lives intact, you will earn three stars. If you lose a life, you will earn two stars. If you lose two lives, you will earn one star.
Stars are used to upgrade your towers and abilities. You can replay levels to earn more stars.
You have to adapt your strategy as the waves become more difficult. As you progress through the levels, stronger enemies will spawn.
You can upgrade your towers and abilities to keep up with the increasing difficulty.