One thing with the 5 mushrooms costing less than carrots, though, is that it costs you two coins to see the wares. Meaning that, say it takes you two clicks to have carrots in the Smith's inventory, the carrots will have cost a total of 104 coins. But with mushrooms, you generally won't have all five mushrooms in one refresh of his inventory. For me it generally takes maybe three or four stock refreshes at a time, to get one mushroom. Meaning: 5x4 (average of refreshes per 'shroom) is 20. Meaning it costs you around 95 coins per 5 mushrooms. It's a bit time-consuming to waste saving 10 coins.
I think it'd run smoother if coin bags 'attracted' them, so that you could place them in such a way as to keep them out of roundabouts and obnoxious dead-ends.
For Tyrant Lord Baal on epic, keep in mind that 'Explosive' damage (fire) heals him. This means that arrows from the Epic War Tower, most spells, and the Lord of Fire (the Djinn or Genie-like Titan) are completely innefective (and counterproductive). To kill him, since it's hard to get past him to kill the castle, you can use Meteor Blast (from the green skill and unit tree, last going down from Elf Snipers). Using Berserk and Rage can greatly increase the damage, but you'll need a fully upgraded Altar (two to the right of Heal, in Simon's [the wizard's, or blue,] tree. Sylphs can stay out of his view to attack him, but sometimes move up too much after a few attacks and end up getting killed by Baal's sword. Once he's dead, send everyone you have at the Castle, and be sure to have some Mana for the Shield spell (after Altar, Simon's tree) because there will be a Revenge Wave and 'coloured' (red Super Units) ranged units that hide behind the castle.
Not bad, really. Some way to see unit stats might be nice. It's hard to compare Gargoyles and bands of Dwarves when you have no idea how much health they each have and whatnot. Other than that, it's pretty good.
Did you know? It's really annoying when you leave the game and come back to find yourself the exact same level because yourself went to the pointless City?