The basic shorthand for the difference between visual novels and sound novels is that visual novels are anchored around dialogue whereas sound novels are anchored around narrative prose.
IncompatibleKaiser definitely not—even putting aside the turn-based tactics battles, it’s extremely systems-driven (and quite buggy on top of everything else, hence why it’s an extremely low prospect for translation, by fans or anyone else). Tim’s talked a lot recently how he thinks Linda Cube and Oreshika are games destined for critical reckoning within western circles but I think Gunparade March is a safer bet than either of those two, just due to being so inescapably dense. (They’re all Alfa System games, hence the comparison.)
It’s also a game that the developers have tried to replicate several times to middling results… some of them are trying again right now with a game called LOOP8, which will be out globally in June, and I’m curious to see whether they’ve come any closer this time, and whether international audiences will care either way or if it’ll be one of those games that JP folk rave about that don’t get any traction elsewhere.