I really think there should be a way to get DS coins without having to get Kreds. Like, what about using Ads? Because it's really obnoxious only getting commons and uncommons, with no way to get rare keys...
I think that there should be a feature where if you know you're going to lose the Invasion, you can just surrender, instead of having to wait for your dragons to die. Also, why no offline gains?
In my opinion, the only thing that this game needs to fix is slowing down time whenever you get hit, because it always makes me take more damage (or so that I'm going to take more damage) because I'm not used to how slow-paced those times are. Kinda annoying.