You might be referring to the game InVected we (me and a couple of other guys, some from our company, some from the university) built for the last Global Game Jam, using Unity for the front-end, and Elixir+Phoenix for the back-end, which synchronized a very simple browser application on the user’s phone with the large Unity screen, allowing them to use their phones as ‘joysticks’. It was a lot of fun, and supports 14+ players (that’s as much as we’ve tested it with at the end of the 48h game jam).
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