FIY : Unreal Engine can be used for free as long as your gains with UE are under 3k euros / quarter.
So, feel free to download it > https://www.unrealengine.com/
(you must create an account though)
Regarding the brush questions : yes, we want the plugin capable of simulating natural media, at least for brushes like pencils, pen, airbrush, charcoal, so we're doing our very best to achieve such results. If you're wondering whether we will also be able to manage "physical" renders (liquid drain, dryness...), some things that can be emulated (like drain), and some cannot (yet).
I'm working on a new video in which you can see how to create a brush with Iliad from the very beginning, from a basic stamp to a dual brush. Hopefully it will help to understand the mechanism.
