Whether you want to stealthily evade everyone, silently kill everything, or stab everyone in the face, you can play how you want. The game doesn't tell you how it should be played and the choice is up to you.
For those that are fans of the Neptunia franchise, Action Unleashed should be appeal quite nicely. While not a main franchise game (this is a spin off made by a different studio), the game retains all the fan service one would want in a Neptunia game. Plenty of inside jokes and familiar references.