Play through a map with two types of enemies. Shoot them and avoid getting shot. Enemies give you health points after you defeat them. Be careful of the boss room or you will get wrecked.
Controls can be found in game by clicking on the controls button in the menu. Game features include a home screen which can take you to the game or an explanation of the controls. In the game itself, you will be in a map which you can move around in, with a gun you can shoot. There will be two types of enemies which can attack you and have health. Shoot and kill all enemies to win. A health bar shows health and an ammo bar shows ammo.
Doesn't work on Brave and possibly other non-mainstream browsers.