Cool game idea! Here's a couple more High Score ideas for you:
9-0 Sequence [just like the 0-9 sequence but in reverse]
Z-A Sequence [the alphabet in reverse]
Nice clone of Asteroids. In future versions it be nice to see an expanded variety of weapons/power-ups available. Perhaps some sort of story mode to accompany this this classic arcade style.
 "Zodiac War"){kind=icon}
 "Hungry Hungry Hobos Update 1 (Double Zombie Burger Edition)"){kind=icon}
 "HighScores"){kind=icon}
 "Deep Space Miner 2"){kind=icon}