The game looks and sounds beautiful - really atmospheric.
The feeling of bashing people off the road really reminded me of Spy Hunter back on the C64.
It seems a little weird that I couldn't seem to leave enemies behind when I'd hacked their speed. I was kinda expecting slow enemies to drop off the bottom, speeding up the screen's scrolling for a bit and new enemies spawning from above.
...unless of course that is actually the way it works and I was just too rubbish to make it happen! :D