Edward, here're a few thoughts that hopefully will help.
The comments about typos is accurate (there's quite a few, mainly they're spell-corrected words which are mis-placed, ie. To instead of Too, that kind of thing). I will usually overlook these in a book that I've bought cheap, and did in this case, so don't let it get you down too much. That said, other people are likely to be less forgiving. My advice to you is to offer a printed version to somebody you know who loves reading (especially this genre) and is willing to feed back the corrections.
Onto the book itself, it started off well, however the ending was so rushed, it's glaringly obvious that you wanted to the project finished and to move onto something else. The last 80% or so was just hammered slapdash into place, it's almost a "Friday afternoon-damn the pubs are open" kind of ending, which seems such a waste after all the effort you'd put into getting that far.