Very good, but the races are way too easy. It's a lot like F-Zero X, bit without the intricacies that made F-Zero X one of the best racing games ever, leaving not much aside from a mediocre-to-good game. I would love to see this game after a bit more polish and expansion, but for now, it's a good 6/10.
Never really played the others, aside from maybe 20-30 minutes to get some of the Achievements. This is easily the most fun I've ever had playing a Tower Defense game. Simply awesome, 5/5.
Great game. It seems to drag out a bit after the first half, though. Also, to kill the dog, you have to shoot it from behind. Let it jump over you and then shoot it while it's back is turned. The last time, you'll have to time your jump over it to get behind and finish him.
 "3 Slices"){kind=icon}
 "Stunt Crazy"){kind=icon}
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 "e7"){kind=icon}
 "Protector IV"){kind=icon}
 "Sparks and Dust"){kind=icon}
 "Don't Look Back"){kind=icon}