Move your character with "wasd" or the arrow keys
Aim with your mouse and shoot by pressing left-click
Press "r" to reload your gun
Monsters spawn in waves and you have to shoot them to defeat them
Monsters sometimes drop health when they die which the player can pick up to increase their own health-meter
Green ammo boxes randomly spawn across the map which the player can pick up to replenish their ammo
If a player runs out of ammo a reloading sequence will begin which lasts around 2 seconds