Unexpectedly really good. I didn't know anything about this going in and just expected a short bout of fanservice.

What I found instead was a fairly large Metroidvania game with interesting combat and level design...and really tight bullet-hell boss fights. That shouldn't scare you off--I'm not great at bullet hell games, but on Novice level, the game is really forgiving. Especially if you go on the usual Metroidvaniaesque hunt for character upgrades. The soundtrack is amazing.

The story is mostly nonsensical, but that's forgivable since it's just a paper thin excuse for there to be a bunch of bunnygirls. The only thing I'd call out as bad is that the game has issues with intermitent slowdowns. My battlestation has a recent i7 and and GTX 780 Ti and I was still seeing hickups in some areas.