I have considered the possibility of adding difficulty settings to the menu, but it won't happen anytime soon, maybe. However, I don't think it's necessary unless the only scene with Jabrayil didn't feel challenging enough for many. And hey, losing isn't always a bad thing ;)
As for the achievements system, I've had some ideas, but I can't say for sure yet if it would make sense. I'll think about it some more. But I'm glad to hear that you find it interesting.
There will be plenty of adult scenes in the game, but the story remains my top priority, so I'm confident you'll enjoy it! I appreciate your enthusiasm and advice. Thank you so much, buddy!