It is dependent on your graphics driver and your graphics card. The browser has a feature called WebGL that allows the game to use the graphics card to render images. This plugin NEEDS WebGL support. But for some drivers the browser inside the game engine decides that the GPU should not be used...
In case someone else got the "Cannot read property 'blendModes' of undefined" error, that's probably because your browser does not support WebGL. For me it worked in chrome, but not during playtest.
For a solution, checkout this thread - the part where you insert "--ignore-gpu-blacklist".
My city has enacted some measures to lock down the city from the plague for the first time in China and it has been reported even on some international news. I'd never imagined my little city would be paid attention to in such a way.