Oh man I´m sorry for getting stuck... but you should collect all the items, the fruits and than go to the bar that is on annother shelve and on that bar you mix a drink from the stuff you found and than you can dive deep into that drink and yeah... go to the goal before you get killed :D
Oh and I forgot to mention: Going up/down should work with the "e"-key when standing close to a leadder. To climb high you have to press "e" several times until you reached the shelve above.
