Making a demo of a single level of a commercial game was a pretty common way of showing off what the HTML5 canvas could do, but I remember people basing it on s

Making a demo of a single level of a commercial game was a pretty common way of showing off what the HTML5 canvas could do, but I remember people basing it on stuff like Doom, where you're less likely to get sued by an angry game dev. I don't remember anything of the sort myself.