My personal favorite is Dead Cells, of course :)

The lead dev uses a skeleton project with the Heaps framework for all his games: https://github.com/deepnight/gameBase

And he also created a very comprehensive series of tutorials for beginners: https://deepnight.net/category/haxe/

I've been meaning to deep dive into it as it looks super fun, but things like laziness get in the way...

Also, the video game Dead Cells, which might even be the reason the language exists. It is an exquisitely designed and executed game which illustrates the passion of its dev team