English is not my native language, please ignore any mistakes.
Congratulations on the game, you all did a great job!
Here are some ideas you could add to the game.
Sorry if something is repeated or if someone has already mentioned it.
1-Time periods (morning, afternoon, evening, night), making establishments have opening hours or events. (This would be complicated because of the content already created.)
2-Survival mode where the player needs to eat and stay clean since there’s already a shower and the option to bathe. Of course, it wouldn’t need to be mandatory—just an optional mode the player could choose at the start.
3-Add a museum where players can donate money.
4-Add a casino with minigames (blackjack, and the other card game).
5-Add places to travel (Rome or Greece, Egypt) with challenges to complete.
6-Add a gallery mode in the menu to view scenes and routes. (This could be a 100% completion achievement on Steam—I’m not sure if the game will have Steam achievements.)
7-Add houses for NPCs.
8-Allow the player to buy a house.
9-Allow the player to buy a studio or use the existing one to create Starmaker content for other girls.
10-Use the wardrobe to change Anna’s clothes.
11-Add content or routes for Zuri, Norah, Charlotte, Isabella, Liz, Sofia, Dr. Frost & Nurse Nina, Tasha, Ms. Kimura, Astrid, Antonia, Himari, Alice, Celeste, Miss Zero. (Ignore the ones that already have routes; in that case I mean more content.)
12-In the mafia storyline, the boss could be male or female, chosen by the player. (This would generate content for Sofia.)
13-Take Anna, Samantha, or Alice to Japan for a cosplay event, or take Adrian to Starcon.
14-Use the phone to invite girls on a date.
15-Go to Hell on Halloween, either alone or with Adrian or Alice.
16-Add a nun to the church.
17-Add content for the Starmaker girls (Ms. Umbra, DreamyWisp, Rose—for those who like that style).
18-Himari wearing a dress at the end-of-year event.
19-Take other girls to the end-of-year event at the house.
20-Make the player visible during conversations.
I know it’s a lot, and some things would be difficult to add because of the existing content, but these are just ideas. And even though Starmaker Story isn’t the main focus of the team, you have a gem here please don’t abandon the game.