After seeing your raycasting game run on the 3ds web browser [as well as on the dsi of all places], I wonder if it is possible to create slightly more advanced raycasting games, as well as a few platformers. A game engine I saw that was pretty compatible with these browsers was Effectgames.com. They have a Super Mario Bros. demo over there, and the ability to remap buttons, making games super compatible. Pehaps a new coat of paint on this sites game library wouldn't be so bad...
If you know anyone who would like to submit games to be added, have them get in contact with me, and I can put their games on either website. Once I have some time, I may migrate over some of the games made for the Nintendo DSi over to 3dspaint.com. Some just need changes to screen size; others may need new graphics.
I agree, this would be so awesome. However, the developer of this site barely has enough time to update and fix bugs as is. My suggestion for now will be to maybe make a blog post and try to rally up a group of web devs to make dome mini games. Maybe a game making contest?