This guide is a full video walkthrough of the game.
It is meant to help you if you get stuck at a certain part of the game or don't understand a puzzle.
I skipped over most of the text and unique deaths to keep the walkthrough brief and to the point. (There are a couple of deaths here and there but they can be skipped via timestamps).
If you want to read the texts that I skipped, you can always pause in between the lines or play that part yourself to read at your pace.
I will also mark the timestamps that could potentially be roadblocks (tough chases or puzzles) so that you spend less time looking up for them ;)
Here is the video :)
3:13 Isolation Ward
5:26 Security room code ------ Roadblock for certain people
8:07 Baby chase
8:37 Corridor to main lobby
9:40 Main lobby
11:14 Boxes ------ Can take a bit to figure out
11:51 Back to making Tear of sea
14:08 Mirror puzzle (Fuse 1)
15:15 Stone gaze (Failed attempt) ------- One of the hardest part for me
15:55 Stone gaze (Successful attempt)
17:40 Video room
18:37 Fishmen chase (Fuse 2) ------- A long die and retry part if you don't know the path
(Almost every wrong turn has 2, 3 or 4 bifurcations that all lead to your death)
20:24 Generator 2/3
21:15 Symbol code -------- Hint for this one was in the Office room
21:24 Making Holy water of death
23:36 Morgue (Fuse 3)
25:35 Me failing recipe (just skip this part)
26:44 Cutscene (same as before)
27:46 Making Grasp of Bondage
28:14 Getting 3rd Fuse --------- You need to think about checking the scientist's corpse again
29:18 Branch - Making Orb of truth ------- Can be missed if you don't see the hints
31:02 Reaching the endgame
31:54 Ending 2
33:27 Fishmen boss (Failed attemt) -------- You can die and retry quite a bit here, just know that you can skip the ending and credits for faster retries.
34:25 Fishmen boss (Successful attempt)
35:00 Ending 1
36:33 Ending 3 branch
37:12 Game doesn't like me (reset to checkpoint)
38:28 Fishmen boss fail
39:05 Fishmen boss success
39:26 Uploading bug ------- Ignore that there was a bug with my video upload
39:40 Ending 3
41:08 Full credits
This is all I have for this guide, feel free to leave a comment if there is a part you didn't understand or if there are endings/secrets that I have missed.