Shiep Shooter

But waves are every level more difficult, so you need to upgrade your tower. For every kill, you get one coin. If you have enough of them, you can buy a new skin or a powerup, such as a shoot speed, a better wall or a repair speed. There are a total of 100 waves, and if you you pass them, you'll enter the infinite mode.
This is my first game, so there might be some bugs...