Voltage is currently having a sale of there games on the Nintendo store
Seduced in the Sleepless City -50%
even if TEMPEST -50%
My Last First Kiss -50%
Kings of Paradise -50%
Ayakashi: Romance Reborn Dawn Chapter & Twilight Chapter -50%
My Forged Wedding -50%
Kissed by the Baddest Bidder -70%
Star-Crossed Myth - The Department of Punishments - -70%
Star-Crossed Myth - The Department of Wishes - -70%
Enchanted in the Moonlight - Kiryu, Chikage & Yukinojo - -70%
Enchanted in the Moonlight - Miyabi, Kyoga & Samon - -70%
SALE ENDS: 19th of July 2023
So the way the voltage switch ports work is that like other games you pay a flat fee to buy the game. This gets you a lot of content that would normally be microtransactions in the mobile version. Usually it's up to some "completion" point (official relationship, marriage scene, etc). For some voltage titles, they then also release dlc you can buy for either content that was released after that point, or that's "optional" content.
Out of the voltage games I've only played through kissed by the baddest bidder to near-completion. And I found the content to be sufficient. It's what you usually expect from an otome game: hours of content for each route. Kissed by the baddest bidder then has extra dlc that are like little extra scenes and such I think, I didn't buy the dlc though. You don't need it to complete the game.
I have to wonder if this way of doing things may end up with some of their games feeling like they lack an ending? I haven't played them all to confirm though, but I'm happy with what I've played so far.