Ok, several stuff I found out!
You're able to get pulled by the shadowy hands at the shrine when Nyx dares you to check it out at a given time.
At Ship Graveyard, when dealing with the blue face blocks, you mustn't leave the area or the damn blocks reset and that's why I couldn't ever figure out why the order was always incorrect.
The dev should step on legos every damn morning for this one.
From there everything was a breeze until I reach the squidy snail bosses (yes bosses, because after dealing considerable damage to the first, a second one appears mid fight (that was interesting)
You don't have to deal with it's tentacles, just aim at the eye and shoot.
After getting the book, I thought that I'd have to go to the library as that is common sense. When I got there the middle bookshelf was open and guess what? Yep, pulled again by the damn shadowy hands.
After a bit I realized I was in Myst City and after exploring for a while I accidentally found out that you can reach places with a simple mechanic that was never explained (at least in the game, I didn't bother to check in the thread tbh). You can jump and then dash to get a long distance for the jump. With this, you're able to find the 404 key and 113 appartments key (Hint: Look for places that have blue/red torches, as they indicate that there's a platform nearby for you to go to. Hopefully, you have a scope installed on your rifle, so use it to scout the area for platforms you haven't reached. If you don't have the scope, well trial and error is your friend).
On 113 appartments, you'll reach a point where you'll have black face blocks, indicating you'll have to fight a boss and it took me a bit to understand where the boss was. The boss is at the water flooded room and you're only able to trigger the fight by hitting it, but you have to know where the boss is. Pay attention to sound and water splashes.
Once the boss is dealt with, you're able to get the Observer's Stone and you have to go deliver it to the statue at the park.
This is where I'm stuck, because as soon as you place the stone, you get instantly grapled by an amalgamation and it seems impossible to break free from it. I think it's related to the book that you have to give to the siren, but I've no idea on how to do this. Anyone knows?
I think I might be an idiot, I can't figure out where to go or what to do. I got to 23% with the City of Mist gate, found the merchant but couldn't afford the fishing rod, do I need to do what the earlier post said and scrounge enough money for it then go fishing? seems like such a non-sequitur.
I've no idea how you even check the completion of areas. I'm not even able to check the area on Mist City, now that I'm there, as it just displays Unknown.
About the fishing rod, it seems to be irrelevant for now, but I could be wrong as it seems I still have things to explore..
Edit* I think I fcked up... Pretty sure you need to give the book to the siren boss I just killed before killing it (if you even have to kill it) Anyone has a save before killing the siren? That'd be great...