No, a lot of the more brutal violence happened off-screen in the anime. Watch it again and count how many times a victim will back up in fear from a parasyte and move behind a large object like a wall; as the parasyte sends a tentacle to kill the person behind the object, blood will spray out from the side of the wall. That happened numerous times in the anime, probably because the manga had no qualms about showing people being utterly mutilated or dissected. The parasyte transformations were also less intimidating and threatening (although that could just be because anime can't translate fear and danger the same way manga can) Among many other scenes, Shinichi also discovered the parasyte's powers by saving a kid from getting hit by a car; that did not happen in the manga. The chapter in the first parasyte manga from the perspective of an escaped lion was missing from the anime. The scene where Migi turns Shinichi's hand into a giant while he is on a date at McDonalds was absent (I know that's nudity, but scenario is still considered character development). A scene with a parasyte man who defends a human woman from a bunch of thugs was absent. Scenes showing Hirokawa and Gotou casually conversating were absent. Scenes showing Kana and Mitsuo harassing other teens are absent. Many scenes showing Shinichi and Migi's character development (with themselves and also with other characters) were also absent from the anime. I can literally go on and on, I've been reading the Parasyte manga for nearly a decade and while I thought the anime was okay, it was ultimately a poor adaptation of one of the most unique mangas ever created. How many times have you even read the manga?