I struggled a bit with the structure, and seeing what information is important to grasp immediately what I can read as I run the adventure. Reorganize that and do a thorough editing pass and you'll have room to flesh out the cool (oops, pun unintended) ideas here.
Much of the art/design has already been said, watch the thickness of details - look at things in pixel mode to get a clear idea of how things will appear. Also bear in mind that black ink tends to bleed outwards a bit, so thin white lines become even thinner depending on how it's printed.