The game is more complex than the rest I've tired so far so its understandable that he needs time. Every event takes about 5-10+ screenshots, one day can have up to 4-5+, each with a slight change in writing/scenario, depending on your choices with the other characters. So yea, alone its well within understandable to be around 2-3 month (as far as I know, he didn't hire anybody yet?).
As for the gameplay, I'm quite fine with this being a choice driven erotic game with build-up and character development + solid story, rather than with mindless characters who seem to be always in heat and just hot for the MC, like he is an irresistable male specimen.
Not to mention, the story usually is just a badly written mess to get you to the next sex scene... Thats unrealistic to put it mildly.
He is making an erotic story, not a mindless, STD-ridden f*ckfest xD True he could've included some more sex elements, but he is doing fine with this being his 1st game. Besides, the corruption takes time but in this case, it seems the MC is getting slowly corrupted mostly.
For me, this game right up there with Melody, Become a Rock Star, Long Live the Princess and Acting Lessons.