This game is indeed very easy, even very young players could complete it in a few hours. However once you have completed the 20 or so tasks, you can continue playing for as long as you want although there are no fixed goals.
There are some minor annoyances; in the animal enclosures your chracter often gets stuck because she can't seem to step around the animals due to bad programming. Secondly as the reviewer below me mentions, there are problems getting animal food at times. For the small animals (rabbits, guinea pigs and budgies) you can choose their different foods at their enclosures. If you want to feed cats, dogs or horses you have to walk all the way to your practice, choose the food in the store cupboard then walk back to the animals. This could easily have been fixed. Lastly you have no way of opening/closing your practice although customers stop coming at about 5:00 - 5:30pm. Since the day ends at 8pm, no matter what you're doing at that time, this means you have to rush around a lot during working hours between your practice, the village (where you get supplies) and the various animal enclosures.
On the plus side this game is addictive and fun, due to its repetive nature rather than despite it. It won't win any awards for innovation or graphics but it will provide you with a few hours of fun when you're bored.