In Frozt players do not live and die by health, but their body heat.
Heat is lost the same way health is lost, but heat can be regained in various ways.
The amount of armor worn and the amount of movement a player has done determines how much heat is regained. When a player's heat is reduced to zero, the player does not simply die, but becomes encased in ice. Instead of simply respawning, the player is left in ice until the round is over, their teammates help thaw them, or if they thaw by themselves. Left alone it can take up to 6 minutes for a player to thaw, but that time is greatly shortened to a couple of seconds if an unfrozen teammate is nearby. A team makes a point when all of the other team is frozen.