From the beginning, I had planned for it to be used to buy objects and advance the story, but I scrapped that idea to make progressing easier. Now, I’m thinking of using it later to buy costumes or gifts for the girls
You can use cash to purchase upgrades for buildings in the village to attract more visitors. Upgrading the café, bar, and church will unlock new scenes featuring the heroines and boost your status with them. You can also use cash to buy not only outfits for the characters but also various “accessories” for them. Btw, your game is a magnum opus of visual novels. Good luck with development!