Hi! Thanks for trying it and I'm unhappy it's not cooperating with you. So, if you have a few moments to check, would you be willing to turn on your browser console (usually [ctrl]-[shift]-[i], then start the game from the itch.io page? Specifically, look for warnings in red or yellow like this:
If you see any of those and you can copy and paste them as a reply here, I might be able to tell you what's going on.
Another thing to try is to go to the three.js home page -- https://threejs.org/ -- and click on one of the examples (this one shows a lot of the stuff I'm using: https://virtual.bbcmic.ro/?disc1=elite.ssd&autoboot) and see if those work (that indicates that I'm doing something wrong...).
Unfortunately using the 3D engine in the browser is a security and configuration nightmare. Three.js smooths a lot of that out, but it can't cover everything -- like if your video card is too old for the browser to use for acceleration. Hopefully the messages in the console will indicate what's going on if that's it.
Also, apparently on some browsers, you explicitly have to turn it on. This topic might be helpful? https://superuser.com/questions/836832/how-can-i-enable-webgl-in-my-browser
Hope you're able to try it out!