A little more instruction on Souls would be nice, otherwise I would have gotten further more quickly. Exponential notation being an option would also be nice. I understand that you may not be going for a game that can be completed quickly, but after beating the first 3 castles, securing gold enough to buy 100 demons as quickly as I can throw them (and still be making money), I calculated out somewhere between 28000 and 35000 clicks for me to bust down all the castles. That's assuming I continued from where I was, and using highest-efficiency units, would take an extraordinarily long time that I don't really feel like spending on a flash game just clicking even though (realistically) I've already got the resources to end the game. You might want to set it up so you can only hit the next castle up before moving on, as you could feasibly move past before needing to do other castles. Being able to auto-assault the next castle in the campaign would be useful (some kind of commander upgrade perhaps?) to continue the idle-type game-play. Perhaps upgrades there to increase the rate at which they throw minions at the castles, auto-buying minions, and access to commanding greater minions as well would be a nice addition. Still, at this point it's little more than an executed idea, not quite polished or well-thought out for your main-gaming crowd, even though it's been out for nearly 8 months.