[Admins]

In the gani you will need to add the different tree graphics so that you see them on the left side (for Kujis example use sprite numbers 20 to 25), make the gani single-direction, and add a sprite in the middle. Use PARAM1 for the sprite index, and modify the default param 1 to a value to 20 so that you actually see the sprite.

Alternatively you could also do many different tree ganis, and at the second comment you see the animation depending on this.life, like
if (this.life==5) this.ani = "mytree5"; else this.ani = "mytree4";