Game building question (with small GA)

So here's the deal. I have many years experience creating games using Flash.

I want to get back into the game (so to speak) by making a little touch screen game. I'll probably use javascript, but I'm wondering which of the many tools out there I should invest my time in to make this thing.

I haven't decided if this game will be html, mobile, or what.

Any suggestions? Also, here's a little GA