I've made a simple canvas game in HTML5 Canvas.
Canvas is a really great API which allows to do awesome things combined with javascript language. It’s a standard alternative to Flash and for that kind of usage, I think it can fairly compete Flash.
You can test the game in a recent browser (canvas-compatible like firefox, chrome, …) following this link.
If you want to hack the code, see the javascript here.
The game was simple to code, except maybe the animation managment which require some optimization perspective. The code source is still not perfect, I may improve soon.
Video demonstration
Released with the GNU General Public Licence.