Cute.
Too much clicking early game for my tastes, but pretty quickly you can stop doing it. Though that will block some late game unlocks.
Way too much explanation for my tastes as well.
The second additional spell is basically a worse version of the first. Maybe swap it with bomb and/or make it more interesting.
Kind of peters out in the late game and I lost interest before finishing everything.
I probably would find it cooler if it weren't based on these sort of sessions you finish, and instead you could travel between zones by clicking the roads and ladders and such, and you could look at the orders and such any time. Maybe the zones could be unlocked by potions that are unlocked by prestige levels, rather than the prestige levels themselves, with some implied story that you need that potion to overcome some obstacle to travelling there.
Also, I couldn't help but notice each character has a little blurb but it has nothing to do whatsoever with what potions they ask for, even though it sounds like it should.