Grade A
Your game is awesome. The Castle-screen was the best extra along with the upgrade and level names.
The Throne screen and its upgrades kept me going.
Leveling the difficulty must have been a hard job. But the upgrades made that useless, since I managed all levels with a standard setting of units. (- point)
The music fitted perfect and the "cartoon-esque" outfit was just right.
Furthermore I liked how you integrated the fast forward button into the rune like ornaments.
And the concept is innovative.
But I think I encountered a bug. When lowering the spellcosts, after using a spell once, the costs would rise in steps from 200,250,300,... instead of 180, 230 and so on