Visuals are usually important in visual novels. I can talk about the art style, animations, and maybe some specific features like CGs (cute girls illustrations) and background art. If there are different visual styles or modes, mention them.
In summary, structure each section with the standard write-up elements, provide general enough information, and make sure to mention the multiple paths, character interactions, and choice-based storytelling typical of eroge/visual novels. To love a googirl -v0.40.3- -XEY-
Features to highlight could be multiple storylines, different endings based on choices, character development, etc. Maybe mention if there's a save system or replayability. Visuals are usually important in visual novels