1- It's his personal project, it's making something that he likes first with some direction and recomendation.
2- You havent played the game if you say that the diapper stuff (7 enemies/npcs) is everything, there's about 7 different NPCs per area. I'm not counting different interactions they may have (like the bimbo ghost, different attacks, etc), the saloon (has many different NPCs), or the under construction area that has the rabbit x3, gloryhole, the trap, fail scape x3 and checking on the horse's ass, which are all like 3 NPCs but different ways to interact, and animations.
If you dont like those things, just dont go to the area dedicated to that stuff, if you want more content wait, if you dont want to wait then go pick up other stuff in the mean time.