From what I see so far, It's seem to me the creator trying to recreate BukKaKe Party 

1.Rhythm based game (CHECKED)

2.Gay erotic (CHECKED)

3.Combo system (CHECKED)

4.Increasing rhythm speed (CHECKED)

5.By part erotic system (CHECKED)

Or perhaps you have different game reference you can tell me, well it's still a great game either way, goodluck for succeeding the game.

BeastBeat came about because I wanted to make the most of my animation skill，
I chose music games because I was looking for the right type of game when I saw a tutorial on making music games,LOL