Very impressed by the overall quality of this game! The concept is fun, original and well implemented. The introduction of new mechanisms kept the gameply fresh, without overwhelming the player. I absolutely loved the atmosphere and the whole narrative you developed around Not Alone Inc, the voice over was great and the little introduction of each level felt like the right length: not too long, while giving us a simple but sufficient reason to scare those humans! (not to mention I loved the humor) Interface and controls are clear and well presented.
After the first two levels I did struggle a bit because of the addition of the door (I like the idea though!). To give you some (hopefully useful) feedback on how it went for me: I found that it was faster to use keyboard controls (1,2,3) to switch between ghosts, however I would then often miss the E key on my keyboard (so maybe using right mouse click instead of E would make it easier?). And I also found it easier to play with the game NOT in fullscreen, since each object was closer to each other (faster to select object), and it made clicking on objects vastly more accurate (I played on Firefox). Maybe not allowing ghots without energy to enter objects would also help (I would sometimes not be able to close the door on time because I had one ghost without energy stuck in the door, and another one with energy but that couldn't enter because of the other one…).
But overall, congratulations for what you achieved in such a short time: great game mechanics paired with great atmosphere, and already pretty polished! It definitely has the potential for more.