It’s a twine game, but I recently found Oblivious Melodies, which has a Regency/industrial-era Britain inspired setting. There are already 5 chapters completed with 1 more to go in the 1st game [edit: the 1st game has been completed as of June 2024], but it’s planned to be a 4 volume series. Just keep in mind it’s not like a COG/HG with a blank slate MC, you alternate between playing two different set characters (which I didn’t think I’d like but they both have interesting stories IMO and you can still make choices for them). And if you haven’t seen them here on the forum yet, there’s WIPs like The Adventures of Sherlock Holmes (set in Victorian England) and The Flower of Fairmont (an epistolary game set in a Regency/Victorian-inspired setting, it has a female genderlocked MC).
For high school there’s Just Kiss Me (although it does have a magical element similar to Freaky Friday) and Help! I Can’t Find My Glasses!. For slice of life there’s Merry Crisis and Apartment 502. These are all WIPs btw!