Overall, really cool. Def worth expanding this further! I wish I could see the code of the leaderboards though, to see how they got such low scores.
A fantastic product for CSS and Frontend lovers. Kudos to both Kushgras for implementing this.
Also, it would be nice to have a bare minimum for markup validation. Perhaps mark validating HTML entries that render fine with a green tick so competitors know the baseline. I'd think 150 characters validating beats 150 characters not validating, yeah
* Don't get me wrong… it's super awesome to see what can be done with CSS and browser behavior. To get the best score possible one needs to ignore quality tho. :D