1-There is no store (website) with sex toys, they would give a little variety to the game.
2-The game has masturbation for a robot, but not for a man (Anon) and it's strange why it wasn't added because it's a separate genre in sex.
3-At the beginning of the game, it is said a lot that Anon was fired from his job, you can add a website with part-time jobs such as a dellveryman or in a store, this would be a plus to the plot and variety in the game.
4-It may not necessarily add to the game, but l would add character leveling (strength, stamina, sex skills, fishing, and anything else you like) that's plus the content and the point of continuing to play.
There are many more things that could be added, but for now it's better to add at least this.