I used to work for a company writing visual novels and they had various guidelines on how to write them that we had to stick to.
For example, be mindful of how many clicks players have to go through before getting to the hook of your story. Because of this, we would write stories in Excel cells rather than a Word document so you can more easily track the number of lines.
Generally, a good rule of thumb is to have the inciting incident happen within the first hundred clicks. I would aim for much earlier than this, if possible and try to front-load the opening moments with hints to exciting directions to where the story may go, foreshadowing the romance, the danger, etc.
Regarding romance, I found the book "romancing the beat" invaluable help in providing a tried and tested structure to my stories.
Anyway, good luck and happy writing! I'm very happy to give my worthless feedback on anything you come out with!