Your questions could be considered off-topic since it actually isn't addressing the game. This question has been asked in the general discussion thread quite a bit and that is probably a better place to ask questions like this. Here's a link to one recent:
https://f95zone.to/threads/what-do-you-think-about-minigames-in-a-vn.103532/
Also, In the end - you just need to create the game YOU want to play and what YOU want to see and what makes YOU happy. You'll find your own audience. It may be an audience of 500 or 5,000,000 but in the end it will be something that will be more enjoyable for your to endeavor. If you are looking to make "bank" on a game, that is uncommon - whether in adult games or general public games. Beyond that, if this is your first game - it his highly unlikely you will make "bank."
Use this time to learn the process, streamline the process while enjoying the product you are producing. THEN you can use what you've learned, both in skills and expertise, as well as public demand for the next game. In stage theatre, we produce one insipid cash-cow show that bring in the public for each show we produce that we do out of love and passion.