Glaring game deficiencies: magic
Requirements for magic:
Easy to play
I'm thinking that instead of explaining magic use in terms of amount of energy you can wield (manna) to explain it as your mind/body/soul's capacity to channel that energy, and having the currency be called 'mettle'.
I've also had in the back of my head for some time, that, I can no longer seem to justify breaking magic into two groups (sorcerers and wizards) and may need to just combine the two.