Green Envy (Expert) is the second stage in Growing Green.
At the start of the level, many Owlbrows will appear. If you go REALLY slowly, a Mooth will appear before you can hit the enemy base. When the enemy base is hit, Teacher Bun Bun will come out. Mooths will also spawn constantly after the wave of Owlbrows dies.
Save some money and spawn Dragon, Jamiera and Crazed Whale when the Owlbrows come near your base. Do not spawn too many of them. If by the base your Worker Cat is level 6 or higher and it is full, you did a good job. Right before the you hit the base, fire the Cat Cannon to knock back Teacher Bun Bun to give the player more time. At the same time, start spawning all of your cats. Cat CPU might be of help here, the spamming needs to be constant. Mooths will spawn with Teacher Bun Bun, to provide the player with money. Once Bun Bun is dead, you win.