Thanks for playing! =)
Snake doesn't die when it's turning into self, it's more a feature then a bug. There are several design problems with a snake's abillity to cut itself and it also can make a game too difficult.
Have you tried holding 'S' playing Tetris? This is the only way to speed the block up.
About the score table: excuse us for this, I have just uploaded a patched version. Also, mind that score table isn't global, the game stores it in your browser, so don't hesitate to share your record. =)