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

Scary

Weeb shit that defined a generation

Moon is in the title of both

Some levels take place at night.

Both have music

Both have music

The narrator's of both are insane

Weird shit happens

Japan

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

You can program Melty Blood characters into the game.

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.

Time Vampires.

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

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

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

Both games have blood in them.

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.

Joker is Shiki for beta males.

Both have underaged characters engaging in dangerous activity.

Boo's Mansion/Tohno Mansion

Also Mario can die.

They both have music.

One of the guest characters is from Melty Blood.

The protagonist gets possessed by an evil entity that reincarnates.

Horror Vibes and Cute Girls, also death.

Sexual Content

It's a visual novel

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

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You are a vampire

Vampires

You kill things.

There is a stage that starts you on the moon.

Zombies

There are undead creatures.

Sexual Content

There are night missions.

There's powers higher than mankind.

Also it's a visual novel.

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

Moon is in the fucking title.

It has the moon in it.

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

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

Consumption of hallucinogens

Kingdom Hearts is just a big moon in the sky.

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

You slice people to instantly kill them.

Gwyndolin is literally Arcueid.

You have sexual intercourse with women

Ken is Blonde and wears Red.

You have intercourse with women

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.

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.

Originator