The game itself is really good, but it can easily be broken:
-Combine Hammer with Key to get a chance to get keys when you click
-Turn on Auto-Climb
-Upgrade your lockbox to your max. level you can do
-Use the hammer you crafted to get keys
-when the hammer breaks, you get a new common hammer, that is equal to your lockbox level -> you upgraded you hammer without using a key
-repeat the process
after this i ended up with 50 keys and could just get more and more floors and mirrors
my suggestion to fix this: make the "key-hammer" crafting unavailable for common hammers, maybe even rare hammers
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