A free app for Android, by Tech Tree Games.

If you are searching for a game that is great for killing time, check out Tower – Idle Tower Defense. In this game, your task is to control a tower and defend it for as long as you can. This has a simple gameplay but requires solidified strategies in the early game to enjoy benefits later on. You should also be smart in investing your coins.

In the game, you can upgrade different elements, including your health, defense, health regen, thorn damage, lifesteal, and more. You can also collect cards and add them to your inventory. Your card collection can give your tower so many bonuses.

If you are competitive, you can join live tournaments and unlock more powerful weapons.