That is in the works.
I want this to be a VR game first, with a flat 3D mode after the VR part is fully fleshed out.
You can download a WebXR emulator extension to play in flat mode. it is a little tricky to get working though.
In the meantime, I recommend you try out the original :)
https://www.snopekgames.com/tutorial/2023/how-make-vr-game-webxr-godot-4
I followed this tutorial ^