Imagine just a kid on Windows, you have to go to the download page, find the right link (not at all clear from your CSS styles by the way). Then, if they don't read the warning you'll have a security warning. Then, Windows will warn because it's a downloaded executable from a website. Then you have to find where it extracted it and then run it!

Port it to WebAseembly/WebGL already! No downloads, no warnings, also works on phones, etc.

EDIT: just wanted to add that you have something really incredible in your hands, try to make it more accessible, more tutorials would be good

Is turtlespace planned to be open source? Wondering if possible to contribute. Its a very nice platform - congrats.