New enemy: Jet Pack Guy (not final name)

Implemented the Shark enemy & water physics. Not sure if I will keep the sinking behavior as default though.

There is a bug with the drop through platforms that I will address at some point.

Concept for an inventory interface

Boss fight concept

New weapon: Laser sniper rifle

New enemy: flamer

New enemy: kamikaze

New Boss fight concept

Simple switch, it does more than just open doors so if you see one give it a go.

A lot has happened since last update. I think I will let the video do the talking.