The moon is trapped in the blue swamp and is being smoked by the pumpkin monster. You can plant 5 plants to repel the pumpkin monster.
1. red plants: high levels can issue multiple fruit bullets at one time
2. green plants: emitting a green mist, causing constant damage to surrounding enemies
3. yellow plants: repel the enemy
4. black plants: fruit that produces a range of damage
5. light blue plants: pull monsters and continue to cause damage