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This is a paid asset, but now you can download Alien Planets Vol.2 Free.
Detail this asset from Unity Store: Original Link
Alien Planets Vol.2 v1.0
Assets to create your own Alien Planet environments! The assets are optimized for mobile and VR.
Videos:
Video walkthrough
Features:
Includes 4 examples scene to get you started:
_All props, creatures and terrains assets are using only two textures/materials.
_Include 4 different skyboxes
_4 alien creatures with an idle animation and 3 skins each.
_Structures, terrains, cliffs, vegetation models, etc..
_Models range from 40 to 950 triangles.
_Particle effects: Ashes, Acid clouds, bubbles, volcano, gas cloud, rays, etc….