This is super neat, awesome work! I'd love to be able to download it, perhaps bookmark systems/planets, to use in tabletop games or the like.
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If you use the Itch.io app, you should be able to download it and run it locally. No bookmarking currently (although I considered keeping your view location in the URL instead of local storage and that'd implicitly let you bookmark / link / etc - I might put that on my short list of tweaks to do ^_^)