cute funny alien invading earth. we came in peace - inscription. theme of ufo, space, first contact, childrens

ufo alien space peace invasion earth planet cute vector sci poster friend background card green flat doodle lettering unknown cartoon martian purple outline world war civilization cosmic halloween monster color extraterrestrial kid clip art boy friendly cosmos symbol colorful hand drawn day line bright isolated character unidentified threeeyed smile creature robot funny invading earth inscription theme contact childrens design element ufos children's design