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Hoping I just didn't look closely enough, but is this Windows-only?

It is. From FAQ:

Q: Will there be a version for Mac and Linux? A: Eventually, yes. This is planned for the future.

Thanks, definitely keen on a macOS version, looks interesting I've played with Universe Sandbox which is great, but I'd love this level of detail on planetary bodies and procedural generation.

For what's worth, it works great under Wine.

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