Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics

x86_64 is a complicated instruction set that runs on desktop computer and laptop CPUs. ARM CPUs are much simpler and less power hungry; so phones, mobile game consoles, and Raspis use them. It is not possible to run x86_64 programs on ARM without instruction emulation (read: slow) or recompiling the game. I don't know if the dev would be interested in doing this.