Forgotton Anne, like a lot of indie gems, has a fair number of missteps in terms of clunky gameplay, but it never vastly overstays its welcome with very basic platforming and some cool, consistently well-done puzzle mechanics. The game's main shine is in its art style and characters; and depending on how much you read into it, the theming of the story. You get a strong sense of each character in the game having their own worthwhile feelings behind their actions, and the excellent voice acting brings them all to life.
While the animations are of very high quality and may remind you of animated classics, occasionally there's a bit of reuse and not very many of the up-close cutscenes that exemplify them best.
There's a few important decision moments throughout the game, none of which affect the ending, but some of which actually had different consequences than I expected. They're not massively new moral choice situations, but it's no "Murder babies / sacrifice self to save a puppy" simplicity either.
The game's ending didn't give me a guttural immediate reaction, but it was definitely something I spent a bit more time thinking about after finishing it, and the relationship it has to the game's title. Afterwards the game also gives you access to a time machine to replay any segment of the game, which may help you find missed dialog or other extras.