As others have said, it’s not that different to write for a female protagonist as opposed to a male one. You can have different events in the game occur depending on the protagonist’s gender, but that’s by no means required. I promise you, as long as you get all the pronouns right, hardly any woman will play your game and go, “All these choices were clearly written for a simple-minded man and make no sense coming from the tangled morass of serpentine complexity that is the female brain!”
Especially in the out-of-the-ordinary situations that you find in game plots, men and women have mostly the same motivations: food and shelter, staying alive, friendship, money, saving the world, and so on. Yeah, there are some differences in how those play out, but with a little adaptation most plots written for a male protagonist would also work fine for a female protagonist.
If you feel more comfortable writing for a male protagonist, why not write out the whole story that way, just switching the pronouns for a female character, and then go back and review the female path with someone who can suggest some ways to tailor the experience more to a female protagonist?