Well, it's not at the top of the page, but they did include a short proof-of-concept video of the Simpsons at the bottom of the page.
https://files.vectorly.io/demo/v0-2-simpsons-250kbps/index.h...
https://files.vectorly.io/demo/v0-2-simpsons-250kbps/index.h...
(Edit: I just notice the full-screen button on the video, I really think they should be emphasizing that, since vector video should be able to stay smooth at extreme resolutions)
https://files.vectorly.io/demo/resizeable/index.html
We're still not comfortable putting demos on our front page, for all the bugs everyone's mentioned, and other issues.
Not even sure who posted this on HN, but grateful for the attention / feedback!
There's a relatively low-quality cut on YouTube: https://www.youtube.com/watch?v=Z3ehuHRnC4Q