A suggestion: Maybe put the sell back prices in bazaar higher, as if you buy something for 850 coins (im only level 23) you can only sell back for 3. I mean raise it up to at least 10% rather than like 1%.
@Wegetas get only food upgrades for level (if you can) and upgrade archers. if you send them in they virtually never die, and stock up on mana to start attacking them if they come too close.
Great game even if it isn't the most popular game. 5/5. Your not one of those kong players that make a crap game for developer status its a good game and with some tweaking could become multiplayer.