This seems cool. For going from Markdown to slides I’ve often used Marp: https://marp.app/ — It doesn’t require much specialized syntax, it mostly does the right thing to turn plain Markdown sections into slides. Simple self-hostable HTML output and PDF export options. Already has a VSCode preview plugin, too. I noticed that Claude Code is able to generate Marp slides for you if you ask it, as well.

Best for slides that are just bullet points, full-slide images, and code. Especially code. Less good if you have a lot of images or need to do your own styles or layout.