Ask HN: Tips for making concise demo clips?

Recently I released v1.0 of my vim-like cursor control for Windows[0], and for its README I recorded some clips of myself using the various modes, but constantly find the result unsatisfactory when played back.

I was quite baffled as to how to contrive short use-case scenarios that are self-explanatory without explicitly annotating what is happening on the screen.

It seems to me that doing it well is a sophisticated art, yet I could hardly find any satisfactory literature in helping one become proficient at it.

I would very much appreciate if folks here could kindly share insights and experiences about this particular art. Thanks.

[0] https://github.com/EsportToys/TPMouse