So I actually came back and finished the upgrades, and it showed the there is a third layer. I just can't find the lever the would open the gate to it. Any hints would be great!
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Thank you! We are so happy that you are having fun with our game!
Yeah one lever might be a bit tough to find, we put some illusory walls in the game (you probably found some if you have all the upgrades) and one lever can be found at the bottom right on the second layer behind an illusory wall. (I assume you found the two that are visible.)