A fun game, five star. Two small suggestions. First, as kamikazedna said, a heads up for health would be nice, maybe a green arrow. And second, pulling a pit maneuver( clipping the side of the trunk of a car to make them potentially spin out) shouldn't damage your truck, just like in real life.
This is a good game, but very frustrating. mabie the addition of a holographic "hit box" or something would help, cause i keep missing the power ups and tris by pixels because i over shoot them when i am turning