A simple example was that yesterday I was trying to debug why my MouseDown event wasn't firing every frame and was just firing once like MousePressed. After some digging in I realized that MouseDown isn't actually a primitive mouse event type in my platform wrapper code (Sokol). You get Up/Down. Doing this 1-to-1 wouldn't give people what they usually want (a MouseDown event that fires every frame), so you've got to figure out how to implement that yourself.
As for the Github, it's all a work in progress! I'm actively working on the engine but it isn't really "released" yet. I've got a very active dev branch and some docs I'm working on before I do a proper "reveal".
As for screenshots - what kind of stuff would you want to see? It's just a 2D engine so it's not like I have awesome graphics to show off. The point of it is that it's a code-only framework, there's no built-in editor or anything. I do want to have runnable embeds though of the demos!
Yeah the really compelling thing to me is the knowledge building. For example what I do with my own project is that I take a look at some demo or example, let's say in Gamemaker or GDevelop and I ask myself a few questions:
For me this has been really the best way to build rather "deep" knowledge in this domain, as in knowing how something works under the hood (or how I think it works or at least how my version of it works) vs. knowing how to use it in Gamemaker / GDevelop.Ps. your github could use some screenshots I think