The lack of visual distinction between similar objects at different levels.
I like the game overall, so much so that I have even shelled out some bucks for a gem mine. But the one thing that might keep me from playing over the long run is the sheer tedium of hovering my mouse over every well and mine multiple times a day to determine if it needs an upgrade.
It may seem like a small annoyance, but it is enough to potentially drive away a paying customer. Seems like such an easy fix to be able to tell at a glance what level all my buildings are running at....especially the ones that must be rebuilt every 1-2 days.
Thanks for your consideration, developer-type people!


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