I was stuck after removing the door bars. There are keys on the wall but they are certainly uniteractable. The graphic is so nice, it even run around 20-30 fps on highest quality on my potato laptop. Meanwhile the granpa is patiently waited for me outside the window, "Are you done yet? I wanna murder u, quick with the puzzle and come out here." :D
The UI is not the prettiest but it is working. Hope for more polish. Good submission!