It's nice that you listened to players and learned your lesson since Zuper Green - without having to race against the screen game is way more enjoyable, and playing as punk shooting zombies in urban environment is definitely more memorable than generic astronaut shooting generic aliens.
Still, game could use more random map segments - they quickly begin to repeat, and it's kinda jarring. More difficult enemies with varied behaviours (fast, jumping, shooting, exploding) could be useful too.
Not bad.