cool game..
one tech question.. is the round level created using shaders or 3D modeling software ?. do u use any special physics for this type of spherical world ?
The spherical world effect is actually very simple. It's just... rotation! The way it works is that I put each type of object inside an empty GameObject and gave it a position offset. Then, the empty parent object sits at the center of the planet and has its rotation value modified to simulate a character walking around the planet. Here's what the prefab for the soldier unit looks like (note how the XYZ widget is far below the character):