I admit that I was a bit turned off by how short it was. I must be on the Internet too much. I thought Calvin was going to get raped or something. I guess I'm just so used to seeing dirty parodies and porn stuff here, I've forgotten about basic stuff. This is still great to see, because of how Bill Watterson didn't care much for marketing. I don't think there is any official animated adaptation of his work.
Personally, I'm more of a "Peanuts" guy. It's still awesome to see how faithful you are to the original comic. I would love to see more of these, only with voices. I guess it would be hard to find some good ones, but I'm sure you could get it done. This is probably the highest rated cartoon I've ever seen here that lasts less than a minute.