The font is a bit small. If this is being printed at A5, the referee will need sharp eyes. I would suggest trimming the text down and bumping it up a point size or two.
The background could be tightened up a lot. While interesting, it doesn't add much to the adventure, beyond Earth being a ruin, the home of an imprisoned horror, and ghouls searching the planet for it. Cuts like that would let you bump up the font size or add more white space back into the document.
Interesting setting and a great subgenre we don't see often enough.