Woah, thanks for such a detailed opinion.
I agree with you on many notes, actually. I'm not that good of a writer and Elsa indeed was initially added to kick off relationship with Mikasa. However, things changed a little.
I'll think about what you said. Thanks, man.
No worries, thank you for you efforts on this game. At least I'm glad SNK/AOT fans have a dedicated NSFW game to play, and it's thanks to you! I meant to say something on my earlier comment but ended up forgetting to, and it's that when making a fan-game, the easy path to take is to grab the female cast, give them some scenes, and call it a day. I think it's brave to try and add prominent original characters into the mix, like you did with Elsa and the instructor. You deserve props there; on intent alone that's very commendable!
Definitely will keep an eye on the future of this game, and your future as a writer! Keep at it ^_^!