the game could have a bestiary, i think it could be very helpfull
and a different background in the mines, to be able to more easily differentiate the stones from the ground...
I haven't considered a bestiary, partly because I never thought there was enough creatures to justify it. But It could make things to easy for the player. part of the fun I think is the unknown.
There are a lot of creatures hiding around in the game, that aren't very common, dragons and unicorns and other things, I think it would be more fun to discover them while exploring.