Hi Dice Goblin,
Is there any chance that you will make this available as a print on demand product on Drive Thru (or even better Lulu).
PDF's are great, but I really have an easier time learning games from physical books. I love Cairn and have three books for it (the core rules, the core rules spiral bound, and the bestiary) printed from Lulu (the quality is great).
These rules look amazing by the way.
I definitely encourage you to build out, a hopefully illustrated in your style, bestiary as well. That, and some of the other suggestions in this thread would make for a really nice full featured game.