“Two.js is deeply inspired by flat motion graphics. As a result, two.js aims to make the creation and animation of flat shapes easier and more concise.” It also renders in webgl, canvas2d, and svg, with not much change in your code. Two.js is definitely going on my list of things to try.
Two.js for two-dimensional drawing and animation in modern web browsers
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Shift Your Point of View to When America Was “Better”
How good or bad something is depends on what you compare against.