It's been a couple of years since the retaking of basements from the monsters. Everyone has already forgotten those days. Now people descended into their basements without fear. But now the power is out, and you descended for repair work and saw the problem is not electrical. The monsters are back! And they blocked the exit, so the only way out is to destroy them.
Control keys:
F - Pick up weapons, ammo
1,2,3 ... Change weapons
WASD - Character movement
SPACEBAR - Jump
SHIFT - Sprint
Esc - Exit to the menu
LKM - Shoot