I feel quite bad that I haven't been able to engage with the jam post-submission due to the workload I currently have, but I wanted to take the time to quickly respond to you as I am actually very impressed. None of the levels after the introduction of the key/lock mechanic were playtested, or balanced to ensure that each built on the last (due to there simply not being enough time), and I was almost 100% sure no human would have the patience to pass the level before the final one. In any case, you have my congratulations! And my gratitude as well for the feedback.