Play a full game and you'll be surprised, the AI is actually surprisingly good and gets better as the game progresses, especially given the size of the code.
Where's the unobfuscated code? I haven't been able to find it...
I am not sure you will find. It seems to me that the point of this demo is to submit minified javascript code for an online coder competition.
I am not a javascript expert. but given the size of the code, I doubt there is a great IA underluying. Actually I've browsed the mignified code in order to find the AI implementation. The only clue I spot was a call to the Random() function. I won't state it for sure, because I wasn't able to understand the whole code. But I highly guessed it is the basis of the AI implementation. :-)