Usurpent

The duchess has sentenced a deadly sea serpent terrorizing a port town to death. Carry out the duchess' orders and slay the beast in this spin on a first-person action/arcade game! Wielding a harpoon, you can grapple to objects in the environment and throw extra harpoons to deal damage. Battle against the clock and replay to get the highest score and best rank possible.

Controls:

WASD: Move
Space: Jump
Right Click: Grapple
Left Click: Throw Harpoon