I just downloaded and ran the game. Selecting play from menu goes to tutorial briefing screen as intended. Could you post a video of what is happening for you so I can see if there is something I can fix.
Just watched your video. Game is working as intended. In the briefing screen it says "forward of the installation are 2 free standing towers" those are where you can build. They are the 2 white squares just at the top of the screen away from the rest of the walls. I have now added highlights to these towers and and animated all tutorial highlights. If you download the latest version you should see green pulsing boxes where you can build.