This is a paid asset, but now you can download Simplistic Sphere Gravity for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Simplistic Sphere Gravity v1.0
A Simple Spheric (Planet) Gravity Example for Unity! The package includes all artwork and scripts necessary to accomplish everything seen in the video.
– Player Rocket Boost Logic
– Shooting Logic
– Rocket Gauge Logic
– Camera Smooth Scripts
– Mobile Player Tilt Movement