I like the DS version well enough, too, although not nearly as much as I like the GBA "original"--mostly because I consider the dual-screened iteration to be a smidge too easy.
I'm going to save my first impressions of Zoo Keeper 3D for a separate post that'll be published later this week (or early next), but I can share now that my initial fears were unwarranted.
Gaining access to it via the eShop would be especially nice, in my opinion, as this is exactly the kind of game I'd like to have on my 3DS at all times.
Sadly, the manual I gushed over in this post's header isn't as fabulous as it could've been. Where are all of the adorable illustrations of the zoo's mustachioed curator that I expected to see, for instance?
See also: 'For the ninth game of Christmas, the UPS man brought to me ...'