Second-class hero

Your task is to save the princess. Unfortunately, you are a second-class hero.
You are weak and worthless. Cut the ground from under the feet of the enemy with your ingenuity, perseverance and explosive barrels.

A - D direction of move.
S - Move down.
W - Move up near the stairs.
Left Mouse Button - Attack/Shoot.
Right Mouse Button - Use Shield/Reload.
Q  - Change weapon.