Just updated the game to 0.9.0 (Alpha 2) with an added HTML5 build.
I found some info about this issue on macOS. Some users report that the error goes away after restarting your computer. Let me know if that helps.
So glad you’re able to enjoy! Thanks for the feedback. I’ve just learned that I can’t build for macOS without having access to it myself, so for now I’m removing support. I hope to have it resolved soon.