Nope, no middle path yet. You can absolutely defeat Khazeem in slut mode at the moment, but that's because the slut mode fight isn't really in/doesn't exist yet: for now it just defaults you to the standard one once you get there. Ending's the same, since again, it's just the standard fight. Mahir scene is planned. As is Scratch, but probably not this chapter. Only one formal boss this chapter, though you can fight Mahir as well, and there are harder enemy troops toward the end.
And thanks! Glad you're enjoying it so far.