In our game there are 3 different ways of aiming and shooting: the autoshoot and the manual one, and the hybrid. 

The autoshoot will aim and pull the trigger for you, you just need to move the camera towards the enemy.

The manual shooting will halt this function and make you tap and shoot while aiming at the enemy.

The hybrid will allow you to shoot by pressing a button, with additional autoshooting on.  

You can choose which way you play: the button to establish the combat style is displayed in the settings. You need to enable or disable it.