If Nintendo's Rad Racer and Atari's Battlezone had a child...
Overall, this game is beautiful and handles likes a dream. The vector animations are smooth, and I never experienced any lag once during gameplay. The simplistic style of the artwork takes me back to the old days of vector games in the arcades, and especially Rad Racer. Clone or not, you did this in Flash, and it is amazing.
The music tracks were also very nice, and fit well with the retro style of the game. Though I haven't sampled them all, "Up Heaven's Chimney" was very catchy, and got me through most of the game.
I've looked through the past comments, and I can't say I've experienced the hitbox errors. Sadly, Flash DOESN'T work the same on every computer - I use both Macs and PCs on a daily basis, so I've seen how badly Flash can glitch up.
There is one gripe I have, though: the difficulty. Going through the "story mode" of the game, the difficulty of is very well balanced all the up to the New York track. Suddenly, I'm looking at twists and turns, weaving traffic in ALL lanes, and a very unforgiving time limit. I'm all for challenge, and I really don't mind the difficulty level at all - even though I can't finish the track. :)
The problem is, up until then, every other level was a cake walk by comparison. I could hit collisions on the sides of the road, play bumper cars with the drivers, have a slow start at the beginning, and I'd still win. It felt evenly paced, and each track felt like a scenic route that I could sit back and enjoy. In New York, though, racing a near-perfect run (after 10 tries or so) would still put me past the 0:00 timer, and I'd only pass the checkpoint because I hadn't rolled to a stop yet... even with my car fully upgraded.
As I said, though, this game is overall a piece of solid gold. It's very fast, very addicting, and all around fun. Hell, I kinda feel lame bringing up the New York "issue," considering how the rest of the game rocks so hard! I'm looking forward to more like this.