Hey Chris,
the “gallery”-type tiles were not given overlays for a specific reason in Ikebana: otherwise the overlays would obstruct the navigation buttons, which would make it impossible to manually go through the slides. If you want to enable overlays for “gallery” tiles, you’ll need to add a specific call to the javascript that shows/hides the overlays on mouse hover. I’ve prepared a custom solution for this: please download this archive, unzip it, and upload the contained files into the theme folder (/wp-content/themes/Ikebana/) on your server, overwriting the existing files when prompted.
Sincerely,
Andrii / Satori Studio