I would have loved to see more levels here. I think you have an excellent aesthetic, I only wish there were more places to explore -- a beach front, a park, a high-rise, etc. Would also give you the chance to introduce a little more story into the diegesis of the game, which I think would only strengthen the aesthetic and mechanics.
I'm listening to the ending music as I write this comment, and I don't want to turn it off. Well done, y'all!