The Kick Meter is a gameplay mechanic in Divekick.
Overview
The Kick Meter is a footwear-shaped meter which appears in both corners of the screen, its shape varying for each character. It fills up as the player performs Kicks.
Alongside the meter are two lines, a green one for the Ground Special and a blue one for the Air special. Once the meter fills up past one of the lines, the player can press 
+ 
and spend meter to execute that special move.
If a player manages to fill the meter completely, the character will enter Kick Factor.