Meh
Waaay to repetetive, no real changes, and the bullets keep following your crosshair, they dont fly towards where you fired, so youre pretty much dead as soon as enough enemies are around, as you have to wait for each shot to hit, before shooting again.
Basic idea is good though, building your own track and stuff like that, but waaaay more can b done with this.
Like bonuses for having so and so many corners, and a much larger map. And upgrades.