Umm this does look interesting. I also know a few commercial adoptables/pets script, one of them even has a simple battle system. Unfortunately, none of these is still under development. Apparently adoptables script itself is not profitable enough for any company to make money, it is better for true adoptables lovers to develop scripts.

And incase you wonder, that script's last update time was July 2009, before I got to know BMR and Rusnak Adoptables:
http://kitto.yasashiisyndicate.org/downloads.html

would you say this is a better thing to use than mys?

Well this depends, the two scripts offer different features so it is hard to tell. As far as I know, Kitto adopt has not been updated for a long period of time, and no customer support is offered.

This has some potentiel ,it sure will grow and i'll probably use it in the future...but MAS will always be THE script <3