Hey!
You actually reached a point when "..at some moments, you may even think the game is broken. It just means that you miss something and you need to keep looking.." :)
Yea, there is some bugs but currently they don't block your progress - you need to keep looking. This demo is a lot bigger and you in the very beginning of it. Actually in the video you have correct idea of WHAT to do next, but wrong idea of HOW to do it :)
I have to warn you: game will become harder and harder very quickly