Running out of gold to quickly is one. Also I miss building up HUGE army's and swamping towns. Also with the gold you have to attack with the units right away or else you will run out of gold, and usually your minions will be low level so they will die, so you end up having minions only reach like level 3 before they die. Also the gold is like a timer. I prevents me from putting any thought in to my dungeon because the only way to win is to build a small/cost efficient dungeon. If you added gold mines that would earn like 3-5 gold every 20 turns that would allow me to get more attached to my dungeons and have some more fun. thank you for being a great involved developer and your game is really awesome, And Thanks for reading my last post.
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  FunATuns