There isn't. Luna Engine is very complex that we can't make a demo version. However, you can check the documentation for the basic workflow and see if it's something you'd like to get into. Luna Engine is more comparable to CSS.
Thanks for the reply! Are there refunds if it doesn't fit our needs? I understand if not, since refunds on digital products are rare, but I thought I'd ask anyway.
Sorry, I am unsure if itch provides refunds ;;;