The animation is perfect and the story seems to hold up, it just needs to be presented better.
First of all, the whole thing just feels... off. It's hard to explain exactly, but I think it has to do with a lack of ambience, you need to experiment with sounds of nature to make the world appear to be alive around the characters. Also, the voice acting needs a lot of work. The way each character sounds is OK, but the lines are delivered very weird, and the actors themselves need a little more enthusiasm. Basically, you've got the voice parts down, just not the acting.
There's a lot of potential here for a very funny series. Good luck.