1. There aren’t a lot of mentions of Haxe. Are you moving away from Haxe?
2. Will there be any console support? There are very very few decent 2D frameworks with good console support that are simple and just work. There’s Unity (for 2D... yuck) and Monogame, but these frameworks still have quite a few rough edges.
3. How hard is it to build your own custom shaders with custom geometries. Do you need to delve into C if you want to mess around with vertices and shaders?