on level change:
	if player's level is between 1 and 5:
		set max health of player to 10

	if player's level is between 6 and 10:
		set max health of player to 20

	if player's level is between 11 and 15:
		set max health of player to 25

	if player's level is between 16 and 20:
		set max health of player to 30