Honestly a really good little game. Short but sweet! Love the animations on the ghosts as they get sucked in to the bottle.
I Did run in to a few minor bugs; Ghosts wouldn't cross over open wall doors, and I also couldn't place my bottle down there which made it hard to pass a ghost if it followed me towards one of those doors before and I now had to go back through it. If you replay the game after finishing the bottle counter never goes up so you don't get your ghost form. In the area with the big door one of the crate stacks is high enough that I was able to climb it and jump on top of the walls out of the level (also no collisions on the ceiling, not necesarry, but would prevent this from happening). Last one I found is in the room on the right of the main room (big door one) there is a hole in the floor, I jumped, it was the endless void as I fell to damnation :P Also not sure if these last two were bugs or not; Considering the big door had two keyholes on both sides I imagined I'd need two keys, but after getting the gold one and getting close I heard a clunk, I kept searching for a bronze key to open the door to area on the right of the main hall, but never found it, I approached the door again, heard the key clunk again and won the game. Not sure if I was meant to get two keys or if the two keyholes was just to pull attention to the door. Also on my second go through I went to the right door instead and found the silver key, but I never found a silver door, maybe this was the second key I was supposed to get but because I managed to use the gold key twice (guessing it's a bool that doesn't reset after using the key the first time) it didn't work? Like I said not sure if these last two are bugs or not haha
Personally I would have two small suggestions; the jump feels very floaty to me (although could be intentional because of the ghost form/me being a ghost? Not actually sure if I am a ghost), otherwise movement is pretty slidy but slick in a way that it feels good, usually I like my fps walking very stop and go exactly with when I press the button, but here it seemed velocity based, but didn't feel wrong to me, so props for that! Second suggestion I'd have is a sound (or a different one because I am not sure if one of the sounds the ghosts made was supposed to do this) for when a ghost sees you. I would often round a corner, turn around and there would be a ghost right on me without me having heard that they were following me (I did hear their moans btw, no worries, just one indicator sound of 'hey dumbo you're being chased' would help the hard of hearing like me :P, might genuinly be just me tho since I am partially deaf in one ear so maybe one of the moaning sounds had this purpose and I missed it)
EDIT Reading the comments I see you've already adressed a lot of the stuff I mentioned, great work man! EDIT_END
Honestly though a really great little game, really impressed with the use of lighting and the nice animations including the ghosts and your eyes opening at the start. I honestly think with some polish/expansion of levels/layering on the base mechanics that are there now this could be a great 4-8 hour game concept depending on how many ideas you got to run with ^_^
Really had fun playing your game! One of the most engaging ones I've played so far.
Also sorry for the essay of text >.> I can overexplain stuff, bad habit of mine. Doing it right here <- :P