Awesome timekiller. Two suggestions: 1)"Adept" AI don't use towers much, so in most cases it is possible to split his area in two. 2) It will be nice to see some representation of protected\unprotected territory without doing maths all the time.
Rewarding with XP and loot for failed quests instead of punishing completely removes challenge from the game. How am i supposed to 'lose' the game? Please, add hardcore mode or some sort of penalty for failing normal and storyline quests. At least don't give XP and items for failed quests. Otherwise greate game!
Quom, on most levels you can trap skulls to spikes or traps or fireball them through ceiling. Use their moving pattern.
Imho without skulls there won't be any challenge for a mage. Skulls are funny!
Lanidrak, imho mage is easiest class. most powerful rocket jump (can reach every zone with it), most powerful attack (spamming fireballs\missiles offscreen kills almost everything so you don't need to see it). Slow falling makes him better jumper than warrior. The only problem is dealing with flying skulls.
Great game! I use both kings as mana and health batteries, so all other heroes don't care about mana and health. First levels in Hell mode at speed x4 become pure madness!