I was tired of Unity’s clunky UI because it was hard to organise GameObjects, animate, et cetera. I would have a few dozen folders in the workspace and was constantly expanding and collapsing folders to navigate to the right object.
When I stumbled upon Haxeflixel I was impressed that it was UI-less and completely code-based, which meant that I could organise sprites directly in my code, without any UI hassle.
I felt very obstructed by Unity’s UI and thought that it was very inefficient, thus I decided that it was time for a switch.
Overall, I am very impressed with Haxeflixel and how quick it was to cook things up. There are some handy functions such as the camera effects that Unity didn’t offer. A clear downside though is the lack of resources and tutorials. But I guess that’s what forums are for 