A great financial game, fun and challenging
The games offers a wide array of animals, landscapes and building options. So you can design your zoo while keeping an eye on your incomes and outcomes, as you'll have to take different factors into account, such as donations, salaries, investigation financing, ticket prizes, and the needs of your visitors and animals.
Now, even though you can keep your zoo running forever, you'll get bored after you run out of species to get or space where to put them, and that will vary depending on the size of your zoo but, eventually, you'll want to either start over or stop playing.
Another aspect of the game which didn't seem to be on the developers mind was the graphics, since you can zoom the camera enough to see the bunch of pixels which compose every animal, person or object.
Putting that aside, since graphics aren't a determining factor in this kind of games, it´s a very good sim aimed mainly at people who like to play not with cute little animals, but with numbers.