PlayGalaxy Link is an app for the Samsung Galaxy Note 10 and 10+ that allows users to stream games from their PC to their phone. Games can be streamed both other WiFi and mobile data. PlayGalaxy Link is based on software from Parsec.
The controller in the video comes from Glap. It’s designed most specifically for the Samsung Note series, but it will fit any phone within 7.5in and a within a thickness of 10.1mm. The controller is also compatible with select games over Steam Link. See the full list of supported games here.
Source: Header Image from MS Power User