I think this is a good call. There are a TON of adult games with shoehorned sandboxes that add nothing but endless grind and a lot of frustrating clicking. "This would be better as a VN" is a very, very common sentence from their reviews
A proper sandbox is not a easy thing, and I'd say thank you for properly assessing your resources and for caring about your audience instead of milking supporters for years with an uncompletable project like a lot of others