It looks great, there are funny characters and cute interactions and the story is simple and short. This is just nice. Yes, it is CGI, get over it. Would 2d animation look better? Most likely. Would it also take a larger budget and more time? Of course. CGI entering the world of anime is something that should be supported becouse it wont just go away. Its only 4 episodes so things happen very fast, but I think it handles it well, it gives you enough information so that you may fill in the blanks yourself, and that is in my opinion what a show that hasa limit of only 4 episodes should do.

Do not expect this to be your favorite creation of all time, but watch it and take it for what it is, cute and fun with a nice story that makes you think a little.