Not bad
There's a bug though, not sure what triggers it, but i encountered some tanks that couldn't keep up with me, they got caught just out of weapon range behind me, so if i just kept driving forwards flattened everything in front, eventually more of these slow tanks shows up until nothing spawned ahead of me anymore, thus meaning that i could theoretically go on forevere without dying.
It got a bit tedious after a bit, like s1rcheese79 said, it could do with some upgrades or something, maybe a bit more variety on enemies and attacks