Polygons

Polygons are a type of entity, that spawn periodically. They actually serve as food. Polygons give XP when killed, but Drones, Traps and Guardians don't.

Yellow Square
These are the most common polygons. They give 5 XP and take 2 hits from a lvl 1 tank. They spawn every 0.2 seconds in the Square Nests. This is a basic polygon to Level 1 Tanks, which makes them instantly level up to Level 2.

Will continue later.