Gaming Union writes "Nier is something of a new venture for Square Enix. Traditionally known for their role-playing games, they've had a few forays into other genres in the past, to mixed success. However, one of the successes was Kingdom Hearts, something of an action adventure / role-playing hybrid.
Nier is said to be much more hardcore though, promising a full action adventure experience. That said, after seeing the first in-game footage from Nier, there are still some comparisons that could be drawn between the two games, namely with the enemies."