There many of them. They don't build the actual game for you obviously, they just provide the framework in which to build them. You just put in the artwork and story and such
I don't ever see much grisaia stuff., but i wish i did. I need a gif of that time in the second season when MC punches that girl in the face, but I can't find it. :/
It's amazing. The beginning might be a bit slow perhaps, but you don't want to skip introduction episodes. But right now, it's my favourite airing anime.
Oh THAT. Spice and Wolf is definitely one of my top 3 favorites, but that's counting the anime, manga, and novels all together. The anime is only like 1/6 of the whole story, but what there is is pretty good.
If the basis of a show being witty dialogue between the two main characters and pseudo-post-medieval Europe economics and trade appeals to you, you'll like it. Minimal but some fanservice, minimal action/fighting. All characters and trade situations that can get difficult to understand at times.