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No specific language or engine is required, the only requirement is that the game can run on the web. Common upload formats are HTML5 or WebGL usually. I think Scratch exports to HTML, so you could potentially use that yes. If it's a executable desktop program (.exe or otherwise), then that can't be uploaded here, but you could upload that to Kartridge instead.
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 "NewbSnip"){kind=small}
 "say892"){kind=small}
 "EPGstudios"){kind=small}