A game like Fate/Stay Night has almost no gameplay. It is all graphics and story.
A game like Tetris has almost no story, but the strong sense of objective plays a role for the player that is like a story.
There is very little problem solving in creating a Visual Novel game, particularly if you are making a series of them like the Science Adventure series where you probably got the technical issues sorted out by the first game. On the other hand a game like Tetris has more problems that turn up in implementation and particularly involves some tweaking of the rules to make the game really satisfying.
- how to store data
- how to interact between user and other agents
- how to render
- how to curate the requisite “fun” through rules and actions