hi there,
First of all, I got a small question for you. Why have you chosen javascript for this project(php and mysql are ok)?. Well, games are normally done in Flash using Actionscript. Is it because you wanted to take it to ios devices as a browser web app? If yes, then your choice is good. Perhaps a general trend on what is happening these days, migrating the Flash games to HTML5. I have done earlier something similar in flash and that is the reason I am asking you the question. But javascript to me is also no problem at all.
But if you are thinking to take it as native apps that we install in the devices from itunes store, google play etc, then Actionscript still might be a good choice due to its reach features in animations and smoothness. It can be used for multiple platform from ios to android to windows and blackberry.
Well about me, I am Actioncsript 3.0 programmer working in Flash, Flex and Adobe Air. Please check my feedback "http://www.freelancer.com/u/programmerAS3.html" to find more about me. Recently, I am porting the Flash games to HTML5 using (html5,css3 and javascript). Let me know, if you have to ask me anything regarding anything. I would be very happy to clear you.
Regards