Ok. It's understood - the budget of this film was probably less than filming 5 minutes of a walking dead episode. Just read the end titles, there's only the actors, a camera man, a director, a couple of people making fx's, some make-up, a van driver, a drone camera, an abandoned places scout, and that's about it. They shot it with some DSLR or equal. (that's why the black levels of the movie cinematography are sometimes a bit crushed).
But they created something original, and a bit different, but still recognizable in the genre of "zombie movies". It's a story of friendship and human nature in the face of a disaster. Nothing too special there.
Still this movie was more interesting to watch than many other B-rated movies. It's because you understand the limitations of the really low budget, and are curious to discover how they overcame those obstacles with creativity, acting, some half-lousy fx's and pure "kamerawerk". Unlike some people claim here, the acting is good, and pretty realistic, and of course sometimes it doesn't work to the fullest. But as cinemaphiles, we are ready to forgive the team almost anything for their passionate work.
Out of their loving effort came a film, which got published in prime video or some other major publisher. They succeeded brilliantly and deserve a chance to make another film with 10x the budget! Also the sound track is really really good.