When I watch a movie or an episode on some serie on my TV (Google TV based), I have to find my phone to mark episode/movie as watched. And finding that phone can sometimes take some time … 
As far as I know, Android and Google TV aren’t so far from each other, would a Google TV port of SeriesGuide be quite straight forward?
E.g. this is claimed to be possible: https://www.howtogeek.com/694493/how-to-sideload-apps-on-google-tv/
“Apps and games that haven’t been specifically enabled for TVs won’t show up in the Play Store on your Google TV device. However, that doesn’t mean that they won’t work on the TV. You’ll just have to download them from someplace else. That’s where sideloading comes in.”