The Name You're Looking for is ClickTank.

ClickTank is an easy-to-play clicker game centered around tanks. The player's reaction time is crucial. Simply tap on the tank as quickly as you can. Each successful click adds more money to your account. Use your earnings to purchase upgrades, enabling you to earn additional money and acquire new tanks. There's no need to stress while playing this game. Unwind and enjoy playing whenever you like!