Health

Health is a stat which determines if you are alive or not. It can be depleted by an opponent's attacks, heat, and cacti, among many other things.

It's often referred to as "hp".

Health can presumably be increased to the 32-bit integer limit (2,147,483,647). If one were to hypothetically increase their health by 1 beyond this point, it would become -2,147,483,647 and increasing it further would count upwards.

Increasing Health
Health can be increased by using Power-Ups or equipping armor.

Trivia

 * The armor that provides the most Health is Noble Armor, although Alpha Armor can potentially give more if upgraded enough.