This is a great game overall. Some reccomendations:
1 Add Mass Accept/Delete Buttons so that people with many friends dont have to sift through hundreds, or literally thousands of gifts and invites
2 Have gifts be categorized by the content. I know many people, including myself, who keep items in their inbox because they know they will use them later
3 Increase the number of items that can be held to over 50
4 Allow teams to be chosen for the weekly challenges; people are constantly paired up with people that either don't help, are never on, or have simply quit the game
5 Make at least 1 more breeder purchasable through star gems. I would like to be able to breed more than 1 or 2 pets a day without constantly having to return to the game, which is impossible for when people need to return to their school and/or jobs after the break is over
6 Fix the glitch where if you accept 2 friend's help at once, they might collide and both become unable to do what they intended to