I have been working at my new job for a few months now, all I do is iOS development. So I will try to look at flixel this summer, now that I have a much better understanding of Objective-C. I already ported much of flixel to C# for Microsoft's XNA dev platform, I can't imagine it being any more difficult in iOS. My best guess as to why we all had trouble compiling flixel in iOS is lack of knowledge behind how Objective-C works, so as soon as I have some time I'll look at flixel-iOS and I'll update you guys on it.
This community (for iOS) is starting to pick up some steam.
My specific problem was a lack of OpenGLes understanding, but yes, Objective C also.
I am under the impression that to get Flixel compiling for a Mac, we'd need to:
1. Change all imports of OpenGLes to OpenGL.
2. Change linked libraries to OpenGL
3. Find any calls to OpenGLes commands that aren't in OpenGL.
This is based off what I've read, not experience.