OK, I think we all hit the end.
Sort of walkthrough - feel free to add what (new) you found.
Find a way downstairs to generator.
Talk to Mr. Milton
Find Jake and Mrs. Milton
Find a way around and get into that room.
Pick up the key.
Mr. Milton disappeared.
Back downstairs to generator and that locked door.
Look through the shed's window
Check other shed for clues.
Those stairs to upper floor are now unblocked so go there.
Go to the room in the middle with Mrs. Milton and Jake
Watch that scene behind you (your mother)
Check painting of the ship. Use Q and get out.
Find another scene on the same floor.
It's like 2 or 3 minutes of gameplay. My real problem with this game is complete tecnical mess. In-game menus are unresponsive, if you somehow manage to save the game, loading won't do anything - game will just throw you back at the very start, opening journal and you're hearing moans and voices...
What the hell is with that camera? I thought maybe gameplay will be like "Fatal Frame" or "Dread Out", but - no. You read journal entries about things you didn't even do. Instead of enriching the game with lore, journal treats it as "some book about what happend here but who cares"...
So much potential and so manny errors. This can go either way. We'll see.