It plays too fast and loses quickly, is there a way to increase the search depth?
As I commented below, the source is unreadable, but I don't think it's using minimax. The algorithm simply seems to be don't leave pieces undefended and try to attack opponent's pieces. It didn't see my mate-in-two where the first move was a knight sacrifice.
I like the idea but it has some problems.
I played 2 games and in both of them it left pieces undefended. And when delivered checkmate he ate my defended queen with king :)
They obfuscate the source with one-letter variable names and no indentation to keep the size down, which is pretty silly. It wouldn't be any less impressive if it were 10k and readable.