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You have to install löve (version 11.1) (maybe your package repositories have it already?) then download the .love file and run it with löve!

love Spacetris.love

Is that a compatebillety thing like Steam-play's Proton thing? Isn't really clear when I read the website.  It says it's a framework for making 2D games. hmmm

löve is a framework for making games using Lua. And you can run .love files with it too. On Linux that is afaik the simplest option to run löve games

Cool!