I gave it another spin, but this time the lighting seems not to work, every object on the screen is completely black. You may want to take a look at that :o
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Ahhh shoot... I'm assuming it's the HTML5 version? It may be due to your browser not supporting various GLES3 settings (I just tested it on Firefox and it seems to work fine). Anyways, if you hit ESC, you can change your shadow mode from one of three settings (off, orthogonal, PSSM4) which may solve your issue.