You are going to have to put yourself in Johnny Trigger's skin and use all your aim to go through levels full of enemies that you must kill in order to overcome them.
How to Play:
Basically you must press on the screen to shoot as Johnny advances automatically, and must also do so at the right time to kill enemies and avoid being shot.
Game play:
It has hundreds of levels where you will find more and more enemies, and can also unlock new suits and more powerful weapons for Johnny.
It is important not to leave any enemy alive as you go because they always shoot you in the back, being able to watch this video with a gameplay in English to know how to play it.