Really fun with some good controls.
I like also how approchable the difficulty feels, the fact that you don't just instant die but loose hp and get just powered down a bit on hit allows to be able to eventually get back up and get going with the pickups.
I like the artstyle, a nice mix of colorful retro sprites with road rage XD the music is pretty good too, though the main level music is a bit on the discrete side considering the pure mayhem of bullets on screen.
Speaking of discrete my only gripe (but more of a nitpick honestly) is that the pickups tend to be a bit hard to see among all the rest, even if this is partly eliviated by the fact that you auto attract them towards the player kart.
Not much issues otherwise, it seems really polished already.
Well done :)