Played to my strengths on programming (you know, and the fact that I pretty much had the centipede itself worked out from Round 3...) and just stuck with classic Centipede. Wanted to try adding some new things I've never done before but would be using in the future. Achievements and leaderboard just made sense. Tricky, but not as hard as I was expecting...
And I can't take credit for the 00s. Endmark made that suggestion. "Juiconomics" he called it.