It seems to me that if you want to save money on game development, then it's better not to start doing it at all. And there are already too many low-quality games on the market.
I also think that it is better not to start developing a game if you are not ready to invest. In addition, the price is made up of various factors, which you can read more about here https://ilogos.biz/how-much-does-it-cost-to-develop-a-mobile-game-simple-math/. It's impossible to get a quality product without some of the development stages.