One character with different weapons on two maps. 10 levels against soldiers and 10 levels against zombies. The levels open gradually, the difficulty increases. For passing the levels, they give money, with them you can buy first-aid kits and grenades. You can buy grenades and first aid kits in the game settings.
Controls:
Use the WASD to move
E to use medical kit
Tab to select weapon
C to Crouch
Esc to Pause Game
R to Reload weapon
The Space to Jump
G to use grenade
K to drop weapon
Left shift to run