For those of you wondering why your computer that runs at 3.4ghz is lagging, it's because your computer is more powerful than flash so it's all caused by flash.
Where as a 1.8ghz computer would be lagging before flash started to lag. Actually, maybe even a 2.4ghz.
Nice addon! Considering that it's only beta, it's much better than the demo. Of course, to be a full fledged game there is still a lton of work. Bigger island, possibility of adding more islands and a boat? I'd prefer if the car physics were more realistic than they are now.