1: https://github.com/jroimartin/ssg
If I display images in slides it's only usually 1 image on it's own or occasionally with title text.
I guess if you could use an embedded background image shell commands, e.g. tybg for Terminology, in the Markdown (or other input text) you could make it work.
An alternative would be to use Pandoc to create a presentation and then use w3m to display it in the terminal but Patat would be neater.
For my particular use case: I work remotely and we use video conferencing all the time. Our video conferencing software allows you share a single screen which is neat, but annoying if you need to switch between a browser (or PDF viewer) and the terminal.
I wouldn't use it for "proper" presentations, or stuff that needs a lot of math (LaTeX beamer comes to mind for that).
And it's been feature complete for a long time. I just tried viewing a short presentation I have at BayLISA nine years ago (https://gist.github.com/cwarden/1349583), and it looks fine.