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james33
Very cool little game, quite fun! This really shows off the capabilities we already have with HTML5 on mobile, and desktop for that matter.
nviarnes
I have been using Impact to make little hobby games for a while now. It's a fantastic engine.

Cool demo Dominic!

paintAcquaint
This thing's unplayable on my iPhone4. Welcome to the fragmented world of HTML5. Runs perfectly fine though on my i7 2.8ghz desktop rig.
chc
It runs smooth as butter on my three-year-old 3GS. Smoother than a lot of websites, actually. Are you perhaps using a third-party browser or something? Because otherwise, unless there was a serious regression with the iPhone 4, I think something's wrong with your phone.
geoffb
It could be due to the retina display. iPhone4 has double the resolution of 3GS. Drawing 960x640 pixels vs 480x320 in canvas is going to have some noticeable impact.
jmck
my iPhone4 gets ~60fps in Safari, using iOS 5.1.1 (latest).
paintAcquaint
I'm running Safari on it.
phoboslab
Are you still on iOS 4? Mobile Safari in iOS 5 had a new, hardware accelerated, canvas implementation.

Otherwise I have no explanation why it runs slow for you. As you can see in the video on the article, the game should run just fine on an iPhone 4S.

biiiju
This game is runs really smoothly on my iPhone 4s. I never thought that a html 5 game would run this well on a handheld device! I wonder if this poses a threat to the closed apple ecosystem as the mobile browser evolves. I wouldn't mind using an html5 app that runs this smoothly.