It actually wasn't that hard (maybe I just play too much Touhou or something). The far greater danger was a bug where keyboard input sticks and steers you right into crap.
I held off on playing this after getting bored with the opening segment being so slow. It really picks up once you get out of the home town, and I really like the whole "small world" feel of recurring random mooks. Gives a bit of a personal touch even if none of them really have a chance to develop.
Good for the first several levels, but near the end it was still too reliant on blind luck for the cracks to form right. One of the levels in particular (A Fatal Flaw) relies on hitting about four segments at once, twice in a row -- I can take the shot several times at the exact same position (resetting without moving the mouse at all), have a tower fall flawlessly 1/5 times, and watch it held up the other 4/5 by an inconvenient set of cracks creating a pointed anchor.
Also include low quality option. Even a small drop in framerate will kill you on some of the games (particularly reaction) by unpredictably throwing off rhythm.
Ugh. Flying was the only training session that wasn't agonizingly long. And the Domo-kun shootout was considerably more fun than the entire rest of the game.
The problem is that the engine is the only stat that actually matters. Boost is too situational, and the improvements in turning are negligible and you'll still have to brake around any hairpin turn.
 "RPG Shooter: Starwish"){kind=icon}
 "Boss Battle"){kind=icon}
 "Stunt Crazy"){kind=icon}
 "Castaway 2"){kind=icon}
 "The Adventures of Red"){kind=icon}
 "Book of Mages: The Dark Times"){kind=icon}
 "Diepix Arena 2"){kind=icon}
 "Streamline"){kind=icon}
 "Sieger: Level Pack"){kind=icon}
 "Animal RaceWay"){kind=icon}
 "Doodle God 2"){kind=icon}
 "DuckLife3: Evolution"){kind=icon}
 "Cursed Treasure: Level Pack!"){kind=icon}
 "Road of the Dead"){kind=icon}
 "Formula Racer"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "Roadkill Revenge"){kind=icon}
 "Critter Forge"){kind=icon}