The more cheerful nature of the MC is indeed intended. And he does show moments of weakness, sadness and pain in the Lover Slut route, though it is something that is something one can mostly see in the secret scenes that help develop his character. I wanted to make him flawed, but still likable in a sense.
And yup. Kiss is only an option for forcing kisses on him. There are kisses in the lover path, albeit indeed not something to be chosen. That part has already quite a lot of scenes, so I would not add to it. Generally, I did have the Kiss action there as a forceful thing, because this game does lean on MVOL (My Very Own Lilith), seeing how it is heavily inspired by it.
Either way, I thank you for your opinion on the matter. I tend to write more cheerful characters and I know, I gotta try something else for my next games, lest I only write the same character over and over again.