Took me a while to hit the "Walk" feature, given that this is perhaps for many the major showcase highlight here. First, having to scroll down on home page to "Try it out", then it defaults to "Fly" mode and the Fly/Walk toggle is kinda down&right, would suggest top&left (unless RTL default in user agent =). And when this default Fly mode first opens up, the apartment box is pretty small (1/5 of horizontal space here), might consider defaulting to the biggest zoom level that will still show it completely in all rotations (that's what the user'll do next).

Nice that the glassy surfaces reflect in Walk mode! Was surprised about lack of specular-highlighting, isn't that fairly cheap compared to reflections? Or maybe planned. Not a dealbreaker on the user side tho I'd guess. But given all the gfx goodies from reflections to ambient occlusion in there, I was a bit curious.

Another thing is that sometimes the canvas goes white with Chromium (Version 126.0.6478.182 (Official Build, ungoogled-chromium) Arch Linux (64-bit)). But the slightest redraw provocation (click-that-actually-moves, or drag-that-rotates) resolves that. (But if you know under what conditions your canvas would fill white, you can look around for what might mistakenly cause such conditions..)