I bought my ImpactJS license a few days back and it's very polished. I don't know if the $99 I paid was a bit high, but I'm satisfied with it. There's also a no

I bought my ImpactJS license a few days back and it's very polished. I don't know if the $99 I paid was a bit high, but I'm satisfied with it. There's also a note on the ImpactJS site that it works well on iOS. It also comes with a beautiful level editor. But I'm not expert enough to judge if that's good enough for doing really big games. Indie game beginner here. Just tinkering with it. There are a dozen of opensource javascript game engines that you could use. I've bookmarked a few javascript engines here http://pinboard.in/u:akash/t:gameengine http://pinboard.in/u:akash/t:gameengine Akihabara according to what I've heard, is the most stable out there, but the last time I tried, the documentation was lacking (although they do have a few tutorials which a lot of these gameengines don't have). I'm mentioning javascript engines because you said you needed something cross platform including mobile. This way you could just just wrap the game with Adobe Air for desktop platforms and maybe native wrapper for mobile platforms. You might want to look into tools like Phonegap and Titanium