May I ask which build you've downloaded? (Windows/Mac/Linux) Because that may have something to do with your problem.
Also the game appears to be zoomed in a tad in your video, was this what it looked like while playing? Or is it something with the way you've recorded it?
As for where you've discovered the glitch, you've triggered the next level correctly, however that mechanic appears to be broken. Though this shouldn't be the case given that other people's playthroughs & the numerous tests performed before release indicated that everything works fine, but nonetheless I'll look into this