XCode Actionscript3 Project

I’m taking course: Serious Games at my school. It’s about creating a game in a short period of time with: simple goal, thought-out gameplay and achieves a Flow with the person playing it. Requirements are: Action-script 3.0. But not that Flash drag & drop stuff, but coding with the SDK. Another alternative is program by Yoyogames: GameMaker. My choice is obvious. 
Adobe provides [...]