If you have not played it already might I suggest Love and Sex: Second Base
This game has everything you are asking for.
There is a free version on itch if you want to try it first and the full version is currently 60% off on Steam.
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Back to Starmaker a lot of the exclusive routes you are requesting are hard to implement due to the way the game is designed and a lot of characters having others being a prerequisite of quest lines. For example Adrian cannot fully leave because he is heavily embedded in Anna, Sam and Alice's storyline.
More female/futa only group CGs are expected. We got one in this patch with Emma and Astrid for example.
Pregnancy will be an end scene sequence and not an end game system. It is best to limit expectations with this one.
Gallery is planned for but not guaranteed to happen due to the community feedback asking the developer to focus on story content.
Doc will have list out the others...