1. Defenses, offensive upgrades, ancient elevations are take increasing amounts of gold and rings. However, the amount of gold and rings you win are small. So it takes forever to upgrade a single item let alone multiple winnings. Items either need to be less expensive or winnings need to increase. Barring PAYING for things, it should not take years to upgrade.
2. You build millions of gold in order to upgrade something and you can regularly lose 500,000 to 600,000 in gold while I have rarely ever experienced winning 600,000 as regularly as I seem to lose it. If the calculation is a % of the gold you have, then i would bet i have battled many a person who has just as much gold as I have.
3. Refreshing battle stones should happen sooner than 20 minutes. YOu want people to play more, allow them to play sooner.
4. Leveling of ancients is a joke. You get so duplicates of an ancient that are just primus. Duplicates should allow you to level of the ancient. YOu should not have to pay to use primus. You earned them
5. You should be able to use more than one dragon, more than one ancient. You have 80+ ancients but only use one at a time.
I have been playing for a couple of years now and I am this close to quitting because it feels stagnant. there is more I could write that is real feedback but it seems a waste of time