All right, I think it's pretty good, but I have just a couple suggestions.
The chat looks really generic, which means it looks also unappealing.
If you can, it would do well to add in some background design, other fonts, and color most of all.
Also, text chat doesn't show up when you directly press "Enter" sometimes, so you constantly have to press "Send" on the screen (Or at least for me anyway).
Also, the clearing thing is a little weird for me right now.
It would do well to get a scrolling bar for the chat instead of clearing constantly.
And I also suggest a timer adjuster for clearing. Sometimes it's way too slow for the flow of the chat room.
On another note, I like the concept and the way it was created.
This is really easy to use, and it can be fun just as well.
The only problem, really, is identifying those that are constantly spamming and flaming.
7/10 for the effort and because it's considerably great. Good luck with future development.