itch.io

That is the point. The steam store blocks it, so you have to buy a key somewhere. You are allowed to play it, but since Steam did not include security for their store to lock it away form kids, they just blocked the store for Germans for adult games. 

Are there also steam keys available to buy somewhere? Since 2020 Steam does not show most adult games in store for my country anymore, however we are allowed to buy keys and play them, just the games are not in store.

The the protagonist male, or can you play a girl yourself?

Because this small information was missing: The protagonist is male, so who hoped to play as female migh be disappointed.

Have to add, before people get disappointed not playing a strong woman yourself: Your MC is male not female. So it is a "weak boy meets strong women" topic.