Looks pretty neat but it's lagging horribly. Not sure why, my PC should certainly be able to run something as simple as this.
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This is usually because you have hardware acceleration disabled in your browser settings. All 3D games on the web will lag if you disable that option, including this one
In Firefox, this is "Settings" > scroll down to "Performance" and ensure the checkbox is checked. In Chrome, this is "Settings" > "System" > Check if the "Hardware Acceleration" checkbox is enabled.