I played for an hour and didn't understand a thing. You just walk around the rooms collecting money. You get caught, you die. That's the whole game.
That's what a lack of tutorial does to a game sadly. It could have been mentioned in passing, but I don't really count on it.
In short, escape the facility by the vents. How this is achieved is by opening the hatch and getting a ladder. To unlock the hatch, you have to find the computer/tech thingie, sometimes locked by a puzzle you have to solve, and then find where the vent is. The second is finding the ladder placed inside a locker in a random spot on the map. That's...really it at the moment. Nothing too complex, you have a stamina meter and a flashlight battery to keep track of, plus the threat itself: the, err, well-endowed monster
(does it have a name? apart from mal0 obvs).