I buy and play many HOAs from BF, but most enjoy the more "adult" ones without all the cotton-candy clouds and children's toys colors. Games I have loved include the following, and I've replayed some of them three times over the years. I'm wondering if any other players have a list of their own?

Agency of Anomalies: Cinderstone Orphanage
Dana Knightstone series
Dark Parables series
Eternal Journey: New Atlantis
House of 1000 Doors series
The Legacy: Tree of Might
The Lost Land series
Margrave Manor: Blacksmith's Daughter
Mindframe: Secret Design
The New York Mysteries series
Riddles of Fate series
Royal Detective series
Both of the Sacra Terra games
Secrets of the Dark series
Shiver: Moonlit Grove
Stormhill Mystery: Family Shadows
Most of the Vermillion Watch series

I would add the other three Shiver games to your list as well as many of the Mad Head games. I will have to do more research, though, to suggest specific titles.

My list would include:

Forbidden Secrets: Alien Town
Fright
Lake House: Children of Silence
Dark Alleys: Penumbra Motel

Those all are wonderful, especially Forbidden Secrets: Alien Town and Lake House: Children of Silence, both of which I have replayed on occasion. Don't know how I overlooked adding them!