Hi there, sorry for the late response.
I'm glad you like the scene with Olivia. She's probably one of my favourite characters simply due to her being a super bitch, which makes her fun to write, but that would get old quick if that were all she was. She's gonna be fun for me.
Scope is a bit nuts. I have no idea percentage wise but assuming I can afford to do so, I expect I'll be making this for quite some years yet. When I started making it I didn't start with "I want to make adult games" in mind. Instead it was more like "I want to make this game" and basically put my all into it. One of the goals for it is I want it to have a fairly ridiculous amount of content by the time it's done. The actual midgame starts once you're on a route with all the girls, so right now we're still in the early game. It won't be a quick game to make at all.
With regard to your feature request, while technically possible I expect it would be a massive pain to actually include just based on the way the game is actually built. I'd have to restructure a lot of it to make the feature work, when in theory the only people using it would be people who want to see all the scenes, but aren't aware that there's a gallery unlocker right at the end. The game isn't really designed with the FOMO crowd in mind, and is instead intended for multiple playthroughs once it's done. I might include a feature like this at some point, but not while I'm still putting all of my available time into making the actual content.
There's no 0.22.07 due to the new versioning. Instead, next update is 0.23.1 which was meant to be released in December. Unfortunately, life happens, so the update didn't. I'm hoping to get it released to patrons later this month. Finishing off the last sex scene for it now, and then I have various things to fix and polish. It's as shorter update than the last one because updates are now being split into smaller updates with detailed changelogs so people can decide whether it's worth it for them to play and update, or wait for the next one.