Best solution would be finishing the game with diamond gear and all possible achievements you can still get, then Restart Game and start over with percentage bonus from restarting and completing all the missing achievements. For your question - since you buy a new part of your gear, you can't switch it back.
We want to add some bosses, new map and maybe new enemies. But first we have to finish small improvements and players suggestions. And did you complete all the achievements? :P
Golden Axe and Diamond Hammer were prepared but they looked odd, so we kept silver/grey versions. Also, escape button was planned too, but there's not a place for it. You can close/switch windows with another click on the button/icon or via Accept/Decline buttons.
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Bees increase fill rate and harvest value for ALL cells. I'll provide a bit more information in the next update