i test that on iphone 4/ios 5.1.1 and give you my feedback ! what is you ios version ?
Ok i try to use it ... and it's really unplayable and with big issues.
I not sure this kind of game can be good on a iphone using ios browser because it's too slow for that.
It's never good to make a game for a desktop browser and then try to move it on mobile ... so don't focus on mobile i'm sure you will loose too many time to have something never really playable.