The cost for new space (blueprints) increases way to fast. form 325 to 330 costs 900 gems. What is next 2.5k ? i don't see the point in increasing that fast.
Two suggestions that helps to speed up the merging process on users side. Having a small upgrade-button on each BP on the Overview-tables would be nice (at least after a Set is selected to reduce time of reloads requests, what requires that each type of BP is included in a set - Magn Bow isn't). And an option to merge a BP with another, having the same type and tier (ofc that requires a user-side control, that each possible BP has a suitable level _before_ merging). To activate/deactivate this options a toggle-button is a possibility to remove the buttons when the job is done. To click from window to window is very time-consuming. A last one. Having an option to set a user-defined maximum level for the BPs also would be nice to have :)
Zombie-Nation! Abandoned Accounts and Clans everywhere. This is good for an easy start, but it becomes boring very soon. the Devs must have done something wrong; something important. Otherwise not so many players would have left this.
I have been playing this actively for a few days and there are only a handful of serious opponents; and these have only one advantage because of their experiences.
My suggenstion: Leave or stay but do a quick decision.