@Streetboat
I followed your advice on the box lights and it looks a lot better now! (updated the screenshot)
@Amn
I don't have much of a choice but to use the penumbra monster, mainly because I have no clue how to use and 3d modelling software. And I simply don't have the time to learn it.
Also I can't really make the amnesia monsters fit in very well with the sortoff sci-fi enviroment, so that's a problem as well.
Although I do agree the penumbra monster is not very scary.
Concerning the dialogues inside spoiler tags.