What should be the Game length for this MetroidVania, As I see that other metroidvania titles are atleast 15 hours of gameplay time and the sidequest can extend the game time from anywhere between 25 to 60 hours??
Well obviously with a one-month deadline you probably won't be able to make a 15-60 hour game. I would suggest at least 2-7 hours of gameplay, so it can be played in an afternoon and can give you enough time to focus on art, music, animations, etc., instead of just level (or quest) building. Hope this helped.