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That looks like an interesting project, but it seems it hasn’t been updated in over a year, and is only compatible with bevy 0.6. The current version is 0.11 or something. I’ve had my ass kicked before by relying on projects that didn’t have a lot of support available, so I would stay out of this one.
For games, a big one is that none of the common APIs are supported, apple just supports Metal and nothing else. There are compatibility layers, but it’s a hurdle.