I really like the game so far! I think it has a lot of room to grow and explore new areas while, and the areas already present do a good job of addressing a wide array of fetishes. So far, I've most enjoyed the lab area and the fantasy world, along with the general mind control/brainwashing themes found in lots of places.
For the lab, leaning into some more BDSM themes surrounding restricting movements or milking might be interesting in a similar setting. Maintaining the sci-fi theme in a different setting, something regarding cybernetic augmentation or interactions with alien races would be pretty neat. Or maybe something like being isolated in a spaceship/station with another dude, and having to dominate him before he dominates you?
As for the fantasy setting, leaning into more fantasy races that are unique to the world would certainly be interesting. I really liked the scenes with the dragon (for the size difference) and the orc (for the smell fetish) the first time around, so more like that would be really cool to see. I also liked the minotaur and satyr from the mythological area, so I think exploring the somewhat non-human but still contextually appropriate types of species for those areas would be nice to see.
Something that might be interesting to see in general might be a level that puts you on the other side of things. In lots of levels, you're starting from a submissive role, and either reach the end fulfilling that or by turning things around to become dominant. A level that has you in the dominant role from the outset, aiming to dominate and control a specific individual by the end of the level could be an interesting twist. For fights in this level, instead of fighting to not submit, you would be fighting to keep control over the specific person you're trying to dominate. Of course, there would be the chance for things to disastrously backfire on you at the end, reversing the established dynamic.
I'm looking forward to seeing the new content and how this game develops! There's plenty of themes you can explore with the established structure, and I can't wait to see what's next. I hope my feedback helps!