I love tone of that game, the atmosphere is absolutely great! I see what you were going for and that feels brilliant. However it seems like you've tried to add too many features instead of polishing the game. I'd prefer just the story mode and a bit more work on movement/shooting feel instead of all that time you had to invest in making the artwork, random levels, options menu etc.
I got that Starsky and Hutch feel from the very beginning and that's amazing!