Yes, that's correct. I don't have a PC to build the game on for that platform. The experience should be pretty much the same either way, though. The website version supports fullscreen, gamepad, etc.
There are multiple solutions for MACOS users to run Windows.A Windows build is really necessary, Windows is the preferred platform of most users.
Feel free to build it for Windows. The game is open source. https://github.com/okaybenji/goodnight