Not the best, not the worst.
crihfield, you need some major glasses to not see those are helicopters.
Anyways, the game has a solid foundation, but it seems to be abandoned at the most critical stage. Each lap i make back to the start gives 1-2 seconds of lag time, as well as that the sattelites in the tunnel seem to be invulnerable. Did you make them to intentionally down the train in a couple laps? Either way, incorperating a few health pickups/shootdowns or even a chance to stop and use points for upgrades will really improve the game. As per the tunnel, i suggest taking that out or replacing it with the upgrade/repair center, maybe make a few more enemies on the outside. I see potential, but its at the point to go the extra mile.