What are some alternatives?
When comparing HaxeFlixel and AppGameKit, you can also consider the following products
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
RPG Maker - Make your own PC game with RPG Maker. Our easy to use tools are simple enough for a child, and powerful enough for a developer. Try it free today!
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.
Corona SDK - Cross-platform mobile app development.
Blacksmith 2D - Black is a highly optimized 2D framework for web, mobile games, and playable ads.
Orx - Orx - a portable open source game engine