I played what there is of it and it is short but this is a first start. It was ok, but the English needs work. Most of it I could puzzle out but some of it I just honestly had no clue what was being said and some of it is still in Russian. Other suggestions.
1) More choices, you get like 3 if I recall in the whole thing. Mostly it is just clicking to the next scene. Add choices to the club, add a few girls to hit on with choices, add a choice to dance or try and dance with a girl etc.
2) Kris seems to take the change a bit to well, I think most guys would freak out a bit more, same with his friend. But this could be due to the english translation issues.
3) I would suggest adding in mental changes where Kris feels himself wanting to do stuff, like maybe feel turned on by his friend not realizinghow good looking he is etc, and then mentally freaking out why he is thinking that way etc.
4) I am guessing the girl in the bar is the succubus? If so maybe make it so she teases and taunts Kris after he hits on her and then tells him women are not just sex objects or something and that he needs to have a lesson or something. But maybe you have a reason for how it happens now, not sure.
That is my suggestions and critics, nice little start, curious what you have planned long term for it.