Anything from 5 minutes to an hour. It could be good for the jam
But you also should focus on the player experience rather than the game duration since that is more important.
Players will not play your 1-hour game if your first 5 minutes are not good, or somewhere in your game player gets stuck or has a bad experience
Alright, thanks. I was just wondering cuz I might be overthinking it due to the depth and complexity of the genre. I'm gonna make extra sure we don't overscope our game (my friend and I will be working together). I feel Metroidvanias have a lot of potential and the possibilities are endless, even with a specific theme. You're absolutely right about player experience.
