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Inside the game, in the options, you can configure the movement and 
attack keys as you wish.  and inside the game folder there is a 
notepad with the sequences of blows to activate the sex combos

You can subscribe, get all the content, and then cancel the subscription; you'll still have access to all the games.

Inside the game folder there is a notepad file with a list of 
characters saying which are nsfw, some are neutral, without 
sexy combos

Theres a text file inside the game folder, with instructions about how to fuck for each playable character.

Yes this is a mugen game.

Not for this specific game.

Probably not :(

The full version includes 15 more characters and 8 new stages.

This game doesn't use Unity hub. You are probably confusing it with another game by a different author.

Use arrow keys for moving the character. The keys Z,X,C,A,S,D, are for punch/kick and combos.

Yes, there are some male characters that are compatible to have sex with other male characters and also with futa ladies.

That's exclusive for my supporters on my Patreon. Check my profile.