I played this with my son and his girlfriend (we look for titles that involve puzzle solving elements or read-along styles when we play together). I loved the puzzle-heavy structure of it and it was a lot of fun trying to figure out the clues and codes.
The visuals were nice (except when they were not supposed to be) and very clean. Even when they were 'broken' they were still not eye crushingly bad. It could be frustrating at times but the puzzles were just right. They were neither so easy that we flew through the game nor too hard to where we just wanted to give up.
I would recommend it if you enjoy puzzle games with a dash of creepy and a bit of story-telling.
For a more in-depth breakdown you can check out my review here: https://www.scifiandscary.com/fof-calendula/