Project Alpha has a very unique pet system. Each pet starts out as an egg.
Depending on what kind of pet hatches from the egg, you will have to do different things in order to raise it.
For example, let's say a phoenix hatches from the egg. Phoenixes love fire, so you might need to leave the phoenix somewhere warm, like by a campfire or a hot spring for a couple of days.
If you successfully raise a pet to adulthood, that pet will give you some sort of bonus. For example, a pet might give you a bonus to attack power or mana, or it might help you find hidden treasure.
If you raise it to adulthood, but you raised it poorly, it might still give you a bonus, but the bonus won't be as good. (I.e. Not as much of a boost to attack power.)
If you do an absolutely terrible job at raising it, the pet dies, and you're a monster.