Find battery. 

Find battery charging unit. 

Charge lift to go down one floor.

Repeat.

Can use low battery to power doors to find higher capacity charger. Gives you access to new items, npcs.

Monsters attack, and are attacked by throwing 1 use objects found in the environment. Tank monster cannot be attacked and must be hidden from unless you have a special item? 

You can hide in cupboards and lockers and under beds, but you have to leave your wheelchair. 

If you are attacked, 2 hits get you off the wheel chair and crawling. Getting hit while crawling kills you. 

Goal is to escape the hospital.

Brilliant, I will add this!

I also think it would be good to add an Ending Monologue if the game has finished, and the floors have been completed. 

If there isn’t one already, the storyline could possibly imply that Patient Zero was really the one creating everything, the monsters and such (in some way)— but had only remembered after escaping the place, and understands it fully.

It could be something like this, similar to the first beginning dialogue:

“When things stay in one place for too long, they perish, they rot.

And so I, Patient Zero— who had once been locked under inevitable stillness— have deteriorated, entirely.

The core of the hospital I must be, holding up what remains of its legacy…

I have been there since the start, that is who I am, now.

So as Patient Zero, the very foundation of the place… I had formed everything, torn it apart at the seams, and taken my leave.”

Beautiful, this is exactly what I was looking for!