This is a very mixed title, it's heavily flawed, and somewhat disappointing compared to other mainline and spinoffs of the Neptunia series, but overall I still had fun with it.

First off, you can tell it wasn't written by the main Neptunia team. Characterization fit, but it lacked a lot of the witty and insightful commentary that the mainline series and even titles like Sisters vs Sisters had. It's also ironic ♥♥♥♥♥♥♥♥ on 2D games while being a 2D game, and the halfassed "maybe they can coexist" later on wasn't great.

Combat-wise it's also pretty mixed. It looks like a Valkyrie Profile type of combat system, but there are a lot of uncomfortable waits where you can't do anything. Debuffs are heavily punishing to you as well, and only poison is really useful when used on enemies. You slowly build up AP to power up your attacks, all allies use the same pool. If you use an enemies weakness you'll get AP back to help chain things together. When you can exploit a weakness it's fun. Otherwise, it's a real slog, and fairly boring combat until late game when you can get half AP abilities and ways to exploit other weaknesses. Using items is also somewhat awkward, especially single target items. Early game is very rough as you have so few characters, so few slots to attack with

The equipment system uses the common-in-Japanese-RPG learn abilities from your equipment, so you'll be switching between things often to learn new abilities. You'll definitely need to grind a bit in order to buy all the unique weapons and accessories to learn those abilities.

Exploration is fine, though a few areas are not marked on the map. You start with a jump and a dash, but will unlock a platform that can give you a high jump, and later on a double jump. These are tied to story progression. There's a reasonable variety of zones to explore. Some zones will be locked off after story events pass, making it a pain if a bounty is in there and blocking access to later bounties.

Overall, decent fun but not a great entry in the series.