I do not know if this is a quite right forum, but I post here because I use some graphics from the pekka kana 3.
Hmm, looks pretty cool, but I don't think I'd like the mouse-controlled gameplay. Anyway, it's cool to hear you're actually working on it.
You can use keyboard also.. Mouse controlling is only optional. Problem is that example firefox doesn't always register all the keyboard commands especially if the load in the page is big. Opera handles the keyboard movements best.
Implementing mouse control in browser game is a little must I think and same kind of controls can be used in touch screen also. The tehniques I am using in the game allows this to be played also in mobile devices. At least it runs in my N900. poorly but it runs. Iphone support could be implemented also.