I tested a small app using the corona webview a while back just for kicks, and it worked on IOS and android.
I tested this earlier in the year, so it’s been a while.
I know you want to also include your own flavor of Physics. But they have a HUGE backing and they now have support from
- Mozilla sponsors CreateJS
- WebGL beta added to EaselJS
http://www.createjs.com/#!/CreateJS
You may want to check the out before you go to far down the road in the HTML 5 version.
Larry