I'm just comparing the video made by FallenTears to the one where they made it to the 5th form.
It seems that killing the MR statue is absolutely necessary to survive since its the one thats controlling the Seduces. Once thats taken down, you can take out the other two statues to the left and finally take care of Ariel.
But then again, you have Pink Been to deal with when the timer reaches zero. (Is there such video evidence for this?)
So IMO, this would be my battle plan
1st form (FL)
2nd form (FR -> FL)
3rd form (FL -> ML -> FR)
4th form (FR -> MR -> FL -> ML)
5th form (FR -> MR -> FL -> ML -> C)
6th form (PB (S))
There, that should cause the least amount of casualties.
Note: Bird statues don't do anything if you attack from behind. Use that to your advantage.
It seems that killing the MR statue is absolutely necessary to survive since its the one thats controlling the Seduces. Once thats taken down, you can take out the other two statues to the left and finally take care of Ariel.
But then again, you have Pink Been to deal with when the timer reaches zero. (Is there such video evidence for this?)
So IMO, this would be my battle plan
1st form (FL)
2nd form (FR -> FL)
3rd form (FL -> ML -> FR)
4th form (FR -> MR -> FL -> ML)
5th form (FR -> MR -> FL -> ML -> C)
6th form (PB (S))
There, that should cause the least amount of casualties.
Note: Bird statues don't do anything if you attack from behind. Use that to your advantage.

