At the moment I'd rate it a 7.5 (decent concept, but the execution still has some rough edges… which is to be expected for a game in active development)
Major problems with flashlight lighting renders critical parts of the third room (with the "entrance 3075" door) invisible
edit: A. seems that most of the problems come from misplaced black out squares. B. setting quality to "high fidelity" worsens lighting (which feels extremely backwards).
Turns out I might have been mistaken: one of the item spots doesn't render unless you're standing on the chair there (and it doesn't really show the place as a chair spot)
Grenade aiming is too hit and miss (would help if it showed something like a green checkmark if the trajector will bring it within the radius of a skeleton instead of just displaying the (highly deceptive) trajectory prediction it uses now)