Back a few years ago, I experimented converting Typescript code to Haxe (repo of the converter is there: https://github.com/jeremyfa/node-ts2hx but don’t try to use it on a real project heh).
My main motivation was not that I didn’t like Haxe. I really think Haxe is a great language. But at that time the language got pretty poor IDE integration (especially on Mac where there wasn’t anything like FlashDevelop/HaxeDevelop) and made it difficult to commit to it compared to other languages (like typescript) that already got pretty good editors.
But nowadays, these issues are mostly solved: There is Visual Studio Code (that didn’t exist a few years back) and an excellent plugin for Haxe maintained by the Haxe Foundation. Haxe language + VSCode are one of the most comfortable tools I use.
I switched to Haxe to make games and a load of other things and I am not looking back.
It’s super interesting to transpile python to Haxe, I had fun doing similar things to convert code from Typescript to Haxe and can imagin how rewarding it was to see your python code just compile and run a flixel project! But here are my thoughts: I think you could give Haxe a second chance. It really is a great and powerful language which is easy to get started with nowadays. Plus Visual Studio Code integration is top notch and works on all desktop platforms 
And, if you do like python, there are probably plenty of use cases where python and Haxe+python target could play very well together!
I know all I say here is not encouraging you to work on your python-to-haxe converter, but you asked for feedback and thoughts, so here they are 