Holy F! That was amazing! Precisely done, good gameplay and the best atmosphere from all games I've played yet. Even though I'm not a huge fan of this art style, it just somehow was the right one. Super polished, finished game! Very good job.
I just found few small things I would fix. First one, I had my mouse visible and the buttons didn't respond to my clicks. If you want to control your game just with keyboard, hide the mouse. Second one, just add some effect after you click on New Game. I had to wait few seconds before the level started and some people could think its not working at all. Simple fade out would be enough.
Awesome!