Seems like a Sengoku Basara parody, or maybe its a "Tales of the Symphonia", I recall a character jumping into a bunch of people like this in some opening

It's one of Sengoku Musou (Samurai Warriors), according to the pixiv tags.

but it is not tagged by the artist.
he just say "I wanted to draw cool youmu"

That's the title. The list of tags (in the white rectangle above the image) there's a 戦国無双 tag, indicating Samurai Warriors.

yes,that's the title.
the tags which dont have "*" are not tagged by the artist own.