This is a good submission, thanks for making it!
I like the way you can do a lot from inside the buggy, that makes it more fun to do drive-by maneuvers.
I would say that the buggy is a bit hard to turn, and the lack of plants near the start really makes getting into the game loop tricky- I never quite figured out how long was too long to be away from the dome, because I only ever found 1-2 plants. (EDIT: Just played a round where 4 plants spawned near the start, and those first few upgrades really made the rest of the round more fun!)
Overall, great submission, I can't wait to see the next project you put out!