I am very very grateful to you for taking the time out and sharing such detailed analysis and awesome feedback. Thank you!
And your analysis is spot on! Almost all of the points you raise I already have my eyes on. Like preventing a doll from becoming glitchy right after it has been reset or the player character not finishing the run correctly, or the dolls stacking up in the corner.
A lot of balance is indeed needed, the 3rd level is extremely difficult for me too (the 4th one is basically hell). Thank you once again for giving it your time!