Added a wider variety of keyboard controls.

Added killing enemies with barrels now adds to your score. Enemies spawn forever, but barrels are limited.

Added performance enhancements by cutting down the number of chunks if your PC begins to slow.

Fixed death still opening doors with a key.

Fixed enemies getting killed by barrels.

Fixed the player not being able to walk on top of barrels without jumping.

Fixed barrels from stacking over the room itself.