I got bored, named myself Gaster thought it would crash. Also I haven't beat the game yet, but in a non-canon timeline I got LV 0. Idk what that is about though

Sooo someone told me you can't name yourself Gaster. Buut I did it anyways because why not? Also in a non-canon timeline (before I even beat the canon one) I got the LV 0 thing. Whatever that is about. My name is jumbly