What would you say is the BIGGEST problem in poppy playtime in general?
For me, the biggest problem has alaways been the puzzles, most of them feel really filler, most lack any kind of horror aspect to them, even in chapter 3, which had the best puzzles in my opinion, still kinda suffered from the too many puzzles aspect, like alot of the puzzles have cool scary atmosphere around them, but sometimes its not there, like the concilers offices which was JUST puzzles.
I would say chapter 5 is the guiltiest of this, while there are less puzzles then in chapter 3 (Good job on that mob!) its the one with the worst puzzles because there is almost never any horror aspect to them, the labs are too bright and lit up that its not a scary place at all to solve puzzles, and some of the puzzles just frankly suck, like in some point in chapter 5 you gotta pull these 2 battries somewhere while having the grey hand keep pressusre up and that was not fun at all. (And for some of the optional puzzles, its not clear they are optional at all)
But in saying all of this, the huggy part in chapter 5 was the best use of puzzles, there is a horror aspect (In huggy hunting you, even if his AI kinda sucked and was too easy) you had to stealth around him while doing puzzles. And the yarnaby part, miss delight, and the mini critters all are great examples of what puzzles should mostly be like in poppy to me. I hope for chapter 6 mob will listen to the outcry of puzzles being too tedious/lacking horror and add horror, like scary atmosphere or threats. I think the best move is to make more huggy/yarnaby/miss delight/mini critter parts in future games, but more fleshed out in mechanics and longer in length.