I have been using gamemaker for years it's so easy and very similar to GS (imagine GS but with an option to code and almost every feature you want for a 2d game and that's gamemaker, simply amazing).
What ever happened to the GS plans to allow the option to code? Guess there are more pressing thing on the roadmap...
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http://www.pocketgamer.biz/r/PG.Biz/YoYo+Games+news/news.asp?c=33136
Highlights = pub to HTML 5, Android Mac and PC