Moon is in the fucking title.

Gwyndolin is literally Arcueid.

Blue Moon is a song in the game and the game starts on a shot of the moon.
You also can die and also kill things with one strike, and you can wield knives.

Vergil wears blue and cuts things, Dante has shoulder length hair and wears red, also the moon is on the cover.

You are a vampire

Misogyny

My friend is extremely mixed on both of these but I'm just gonna say it's because you play a guy who cuts people and is descended from killers or some shit.

Boo's Mansion/Tohno Mansion

Also Mario can die.

Sonic is blue and can kill things in one hit, Knuckles is Red and from an ancient tribe. Sonic is Shiki, Knuckles is Arcueid, I am drunk.

Some levels take place at night.

It's a visual novel

Zero is the progenitor of the Maverick Virus and gives it to Sigma who reincarnates himself while also infecting others, Zero is also a robot who wears White and Red and has Blonde Hair while X the main protagonist primarily wears Blue.

Protagonist has black hair and wears glasses, he also uses a knife.

Joker is Shiki for beta males.

You slice people to instantly kill them.

Consumption of hallucinogens

You have intercourse with women

You can program Melty Blood characters into the game.

Kohaku is like the funny devil man Hazama. Here's artwork by ILoveKohaku97 which shows her dressed as Hazama it's based.

Project Moon, Type Moon, they have Moons and are also visual novel makers.

One of the guest characters is from Melty Blood.

You kill things.

There are night missions.

The protagonist gets possessed by an evil entity that reincarnates.

The narrator's of both are insane

Originator

It has the moon in it.

Zombies

There's powers higher than mankind.

Also it's a visual novel.

Both have underaged characters engaging in dangerous activity.

Kingdom Hearts is just a big moon in the sky.

Vampires

There are undead creatures.

Both have music

Scary

There's a DLC with Vampires, and you can recreate the cast of Tsukihime in it if you wanted to.

There is a stage that starts you on the moon.

Ken is Blonde and wears Red.

Weird shit happens

Both have music

Pac-Man starts the game shaped like a moon, and can die, which is just like Tsukihime.

They both have music.

Horror Vibes and Cute Girls, also death.

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You have sexual intercourse with women

Both games have blood in them.

Japan

Sexual Content

There's a vampire and you kill a being called Chaos

Weeb shit that defined a generation

Time Vampires.

Moon is in the title of both

Sexual Content

DIO is a vampire who has blonde hair, and wears red, there's also night time stages.

There's a lot of bad endings, also both games are visual novels.

These are both technically indie projects, the sole difference being that Yandere Simulator is irredeemably shit.