2D shooter VS Zombie

The game is to repel the invasions of zombies. Each expiration of time brings with it a new wave of more dangerous dead. Try to get as many bucks as possible to buy and upgrade equipment. Find a better place to defend before the new wave, thereby increasing the chance of survival. In case of defeat, the weapon leveling level is canceled.

WASD - movement.
E - open the backpack to select weapons.
B - a magazine for replenishing ammunition and improving weapons.
Left mouse button - shooting the selected weapon.
Right mouse button is the use of ammunition.
Don't let the dead get close, they'll catch you - the end of the game.