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Hyperrogue is not quite a top down hexagon world, it’s a top down heptagon world. The premise is that it is a roguelike set in a hyperbolic world, and different regions teach you different weird properties of a hyperbolic space. For example, the crossroads feature an infinite amount of parallel lines and yet there are still forks in the pathway.
Even though it’s foss, it is also for sale on steam if you want to support the dev
Sunshine and moonlight are open source implementations of nvidia’s game streaming protocol they created for the nvidia shield. You can use it to remotely use your computer from your phone, not just for games. But of course the primary application is game streaming. As long as the game can run on the host (sunshine) computer, you can remotely play it on the client (moonlight) device. I’ve used it to just launch steam in big picture mode and then select what I want from steam.