HTML5, but I can't try it in my browser? Or play on my Android?
An Android release is also questionable. Not such a big market money wise, and they would have to port the rest of the environment too (the native hooks), AND take into account the various screen sizes and OS versions (50% of Android users still use 2 year old versions). Might as well don't bother at all.
(Or do you mean the iOS browser? Still, doesn't matter. If you want to sell an iOS, there's just no comparison between the monetization facility of the App Store compared to the browser).