Rays of Gold (Hard) is the first stage in Growing Yellow.
Pretty easy stage. The player will face some easy Angelic enemies. Angelic enemies usually have very short range, and some have good charging skills, which can mess up your army.
A simple way to beat this stage is to stack up long range attackers like Paris Cat, Drama Cat, (Crazed) King Dragon Cat, etc. Don't forget to protect them properly with meatshields or with Artist Cat.
Artist Cat is especially important here, as he can make almost any army work as long as he has a decent level.