The sprites are so goooood 😭 You did such a wonderful job with them! I'm also super duper excited for all of those big plans!!!
As for prices, from my observation, VNs are usually priced around $15-$25 USD, so maybe around that price range would be good? Your VN is honestly high quality, you've worked hella hard for it, and I would definitely pay that price for it, but that's me personally! Maybe doing some sort of community survey would help?
Anyway, I wish you nothing but the best with development! ✨