Just another small patch. Some minor attempts at optimization, let me know in the comments if the performance is any better. (or worse…)

• Walking up stairs should be improved.
• Added a gamma slider. Only has an effect on the in-game view, not the UI elements, due to how I've set up the screenspace effects. This was the quickest solution for now.
• Added a camera sway toggle.
• You can no longer quit or restart after the death countdown has started.
• Changes in AI code that should make the game run a bit better. (Hopefully won't make the enemies do weird stuff too much)
• Bunch of other minor changes.