Hey thank you ! I also really liked yours. I don't know what was the problem for you but mine was to try too hard to have the shadows and go for a dev build (really wrong idea). I managed to fix the color of most of my material/shaders with a hacky "srgb_to_linear()" on the color if the os was "web", maybe it will help ;)
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What tripped me up was the VisibleOnScreenNotifier3D node doesn't work at all in compatibility and the camera system I threw together for the jam relies on it. The more complicated system I planned on originally probably would have been fine but I didn't have time to implement it. Thanks for the tip on the srgb_to_linear()! I'll definitely keep that in mind next jam :D
For now I think I'm probably going to avoid building stuff in 4 for game jams since webuilds are such a big part of that. Hopefully they find a work around in future releases though, 3D in 4 is so much better than 3!