The Final Torch

WASD - Move
E - Pickup/interact
ESC - pause
Left click - Red gun 
Right Click - blue gun

All the torches are lit, except one.

The final torch that will repel the darkness is unlit and you are the last one left to light the torch.

blessed with the light you have the chance to recover after every defeat, but all progress is reset so its upto you to learn and progress to the final torch.