What are some alternatives?
When comparing HaxeFlixel and RPG Maker, you can also consider the following products
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
AppGameKit - AppGameKit is a game development platform for mobile devices.
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.
Blacksmith 2D - Black is a highly optimized 2D framework for web, mobile games, and playable ads.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.