The demo page scroll is very janky, which detracts from the animations entirely. Seems to be because of the excessive use of blur filters - the cards are on a black background so the filter is not doing anything anyway.

(I'm on a brand new PC with pretty good hardware. It's not as bad on the Mac, but it still can't keep up 60fps)

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Nice idea, this looks like it simplifies a lot of the common animation cases.

Have you thought about allowing animations to be chained or sequenced? For example running one animation after another using multiple data attributes.

I like the simplicity. Great job. Though I could have used a demo page with a block for every animation at once instead of poking at choices.