Sorry to hear that. Can you please tell me what are your specs? (OS / GPU / RAM / display resolution) Did you try to set the graphic settings in the main menu to the lowest? Unfortunately this demo is from a very old build so I can't update it anymore.
Thanks for the video! You should lower the quality to Medium, and also the relative resolution to 0.50x to have a better frame rate! (in the Setup submenu on the title screen).
