This is nice; I like how the background updates to show the level-state.

I recently started porting my native iOS game to HTML5. After Xcode/Objective-C, HTML5 development is just so refreshing for the 1) instant reload, 2) succinctness of Javascript. I'm kicking myself for not starting sooner.

Here's a link to my HTML5 game: http://noisytyping.com/NCT6745/index.html (work in progress!)

edit: I just realized I haven't put in a tutorial yet. It's an Arukone implementation: connect all number-pairs, and fill the grid.