Thanks for the tips, if needed I'll try to be more precise if you still want playtesting.
I don't think it is about a piano, I guess at the first floor in the lockers I can obtain an item ? Because a locker has openend but I got no item that's why I thought I got softlocked (but maybe not!). Where I am I have cut the thing off the entrance but still need a key to get in the sewer.
But I'll definetly try again !