Thanks for your interest. I put a lot of work into making this initial prototype work in the browser without requiring a download, but it looks like that was a mistake since browsers are prone to using the wrong, slower GPU (almost everyone these days has an integrated GPU that's part of their CPU in addition to a more powerful, discrete GPU). The next version of the game (sometime this summer?) will be desktop only, probably just for Windows and Linux since I don't have a macOS computer to test on.