What a fantastic idea! I love using excalidraw and I've used it for making slides by just screenshotting and manually editing, this is so much nicer. I really like the example of following a flowchart as well.

One small nit - in your video you use some naughty words, if you're looking to sell this I'd consider dropping that. I probably can't share the video with my colleagues, for example

i'm glad you like it! for the naughty words, it a list of quote from my fav show, slicon valley, but yeah, i will do it better next times. appreciate your feedback.