Haxe + Flambe really is a nice combination for developing 2D games for us at the moment. We cover old browsers with Flash (IE6 etc.) and modern browsers - eithe

Haxe + Flambe really is a nice combination for developing 2D games for us at the moment. We cover old browsers with Flash (IE6 etc.) and modern browsers - either canvas or WebGL, with almost no concern about which ends up running in the end on the client. It almost feels like magic at times. The compiler also generally seems very fast as well. Sublime text makes a nice(ish) IDE with free plugins. Additionally, we can relatively easily compile out iOS and Android binaries should we want/need to. It's a very nice system to work with and has caused us very little problems with just getting things done.