Developers didn't waste time on technical gimmics or fancy graphics. Instead of that they managed to create fairly complex jet compact map filled with 100 different endings. And each ending comes with unique description and each respawn has unique intro text explaining instead of calling it Groundhog Day style timeloop. At first you find endings everywhere by just messing around. But that will only get you to ~25%. Then you have to start exploring and making map as familiar as your home, but even that will give you 50% progress. Third quarter comes from lucky accidents, failed plans etc. Last 25 endings are pretty well hidden and may need help of internal hint system. That internal hint system is literally hints, not cheats. You have to collect notes and unlock few items to fully use it. And using it never reveals too much to accidently spoil anything. It is much better to use such well integrated system than trying to find one spoiler free hint from internet. Graphics are pretty common Unity 2d: Big pixel assets in high resolution world. But that doesn't mean developers are lazy! The world does feel natural, everything kind of fits together and there are few dozen unlockable character outfits which all make sense if you read intros and outros of each ending and respawn.
Katamari-style gameplay is fun, but dark side of stories is unreasonable gross and morbid. There is tortured people, even children, everywhere and gore is too much even for adult if you pay any attention to it. If darkness would have been just gloomy, depressing and joyless, this would have been excellent game with enough levels to play more often than most PC-platformers. Every story starts with video of the nice version and ends with dark version. Gameplay is in between these, mainly following the nice version and showing how enviroment and characters turns dark with few lines of Grimm's commentary. After few episodes, the end videos starts to feel too pointless, you basically rewatch the story you have already played. There are also few too many technical problems. Every story is technically different program and they don't share same settings. You have to readjust resolution and sound levels dozens of times and resolution keeps resetting even if you restart the same story. Controls are simple, but there is no automatic camera and you can't remap buttons. Jump height is some times just a bit too low and causes problems with moving platforms and windy levels. You can also get stuck when game thinks you are sliding a hill but there is another object or geometry blocking your fall. Luckily levels are short so you can always restart without losing to much progress.
