Great, glad to hear the rolling platforms worked this time!
I uploaded a new build (thread here) where there's some simple tutorial instructions for now on some signs. I might replace it with a more elegant and subtle way to teach it later, but for now this will hopefully lead people in the right direction.
The game is a lot about the sensation of heights and keeping one's balance. For people with fear of heights, it's challenging or impossible to play depending on how bad they feel it and how much they're interested in challenging themselves. It's both a strength and a weakness of the game.
I identified the bug you talked about with the gate not opening properly and some textures flashing/glitching. It should be fixed in the new build.
The download key you got will work for the new build (January 29) as well.