Just finished this game and I feel like I need to add a review that is not based on glitches or bugs.
What I expected was either a super-grotesque, "wtf is this..." game that keeps me entertained with its absurdness; or one with a genuinely interesting noir-style story (with a soundtrack from Akira Yamaoka on top of that!). However, neither of these describe the game.
It certainly has many "wtf"-moments, and at the beginning it even seems like it would deliver both of these expectations instead of just one. The art style is superb, the mood combined with the OST fascinating and yet you keep wondering "what the hell is just happening?". However, it just doesn't develop at all from that point on.
The first and probably the main problem is the gameplay. Most of the time you have to fight your way through maybe 10 different types of enemies in total. Almost all of them can easily be defeated by stupid button smashing of your standard attack with some evasions thrown in at random. There is a mechanic to press your evasion button just as enemies attack to counter them with a "smash x!"-multiattack, but the cue and time window for these is so small that I found myself ignoring it completely and just pressing the evasion whenever I felt like it. Many times you even trigger the event with this playstyle. Enemies in the air can only be killed with ranged combat, which basically means holding a single button down for 10+ seconds while aiming at them. In the end, every stage just felt like mindless button smashing to victory. And believe me, the stages sometimes feel like an eternity. There is absolutely nothing interesting happening within them at all. Defeat five enemies, go to the next room, defeat ten enemies, go to the next room, repeat until boss fight starts.
While the bosses all have different patterns how to defeat them, they are not that much fun either. The whole combat system is just too simplistic to have any entertainment value.
Apart from the main missions there is also the possibility to do sidemissions at any point: These are either more of the dull combat system (challenges for time or similar stuff) or the absolutely ridiculous "Gigolo Missions". I'm not kidding right now: In each of these missions, you sit somewhere with a woman and have to look at their body without them noticing. They say like 5 phrases again and again and either look at you or awkwardly somewhere else. While they look away, you stare at their breasts or legs and gain "guts". You also have glasses that let you see these women in underwear and what kind of presents they like, which further increases these guts. Once you have enough, you can give them a present, ultimately getting them into bed that way (and getting a new weapon). I have absolutely no idea what the developers of this game were thinking implementing this. It's the most awkward and stupid thing I've ever seen in any game, even the gameplay during that is ridiculously monotone. Seeing this feels like an insult.
So, what's left? Ah right, the story. Before and after each mission, we get sequences usually between five and ten minutes. These are most of the time completely based on the mission at hand, but all refer somehow to the moon that makes the "mysterious main theme". However, the story isn't really developing in any way. Most of the time there are just a few sentences that leave more questions than they answer. Not in a good "put the pieces together" way though. Some missions are also dream sequences from the main character which seem to point to personal conflicts of him, but they are delivered so flat that there's absolutely no emotional impact at all.
In the end, it feels like the writers just added everything that came into their mind on a whim. The story development is minmal at best and can be summarized with a few sentences. Nevertheless it always feels like the story wants to be poetic and open to interpretation, which makes this even worse. There's even a great story twist that didn't feel like a twist at all due to the way the story is delivered. And while there are many "wtf" moments, including unicorns, vampires, aliens, ghosts and whatnot, the game takes itself too serious to be enjoyable in that way.
Summary: Don't waste your time on this. It looks cool, that's about everything good there is to say.