Did it not work with other browsers?
Viewing post in Incremental Cubes [Prototype4v2] comments
I have the fix, at least for now it works, will be back if it gives out on me :)
1: chrome://settings
2: scroll to the bottom, click advanced
3: turn hardware accel ON (mine was off)
cubes visible :)
Here's the link w/ the step by step w/ pics if anyone else needs it
https://www.interplaylearning.com/en/help/how-to-enable-webgl-in-chrome