Miss autofire? Not with this poorly-coded game! Just hold down the button you want to autofire, unfocus Flash with the mouse (by clicking outside the game), let go of the button, and refocus! It's that easy.
Don't bother trying to get achievements until you have Sir Colin and a few points in some of the attributes, notably spin and acceleration. Use Letter F for front wheelies and Sir Colin for rear wheelies. To get high-level boosts, just jump and somersault in place at the beginning of the level until you have the required boost level, and then go catch up. All five challenges can be done by holding Up and getting a Sneaky Start; you may have to adjust your balance if your stats aren't high enough to avoid losing air speed.
The programming's kind of slipshod in spots; neither the badge reports nor save games (!) work on Linux. This means that the Hard badge must be done in one sitting. Frustrating.
On one hand, I had to kill myself for some of the achievements, which usually means something's gone wrong. On the other hand, great concept and execution.
I don't comment often, but I figured I'd drop this tip: Uncross your eyes, as if to view a stereoscopic image. When you see the two panels merge into one, look for spots that flicker rapidly; those are the differences between the panels.
Your ActionScript has a massive bug in click detection; Flash Player 9 for Linux doesn't mind if I click, and it doesn't mind if I perform the highlight trick.
I'm not going to bother getting the badge.