Really excellent. I love the restrained palette and the old-school characters. They puzzle is also cool and ramps up in an appropriate manner.
I also had to put a lot of thought into how I did text; it ended up being one of the most time-consuming parts of my project because I had to draw it all by hand. But just like yours, it meant I had to figure out how to use text creatively rather than relying on it to display information.