Thank you, thank you, thank you! Very glad you enjoyed the game as much as you did, haha.
With the puzzles, I definitely agree with the insane difficulty range; which is why I'm working on a rebalancing update with my team! The panopticon puzzle (among others) should be a lot fairer once it's out.
[SPOILER TERRITORY FROM HERE ON OUT]
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I agree with your comments on the writing too - my assistant writers and I did our best to create something compelling within the 31 days of the jam - but yeah, Dr. Danger gets a lot more backstory stuff, especially in Room 3. Cautionne is definitely more of a "show don't tell" type of character.
I would love to elaborate more on both him and Dr. Danger in the future in different ways. Dr. Danger in terms of how she behaves in a day-to-day setting, and Cautionne with how his experiences have affected him (though I think the spare ending in the base game may have already addressed that somewhat. I don't mind going into more detail though). I've grown really attached to them both over the past month...
I do have plans for an OST release soon - I'm currently working on the cover art for the OST ATM, so please look forward to that.
To get Busybody, you do need to discover every piece of evidence in one run! As for the final achievement, I believe you need to get all of the achievements in the game to obtain it.
Again - thank you so much for playing and enjoying my game! I'm glad you had a great time with it. :>