Orc fight, first code.

orchp = 20
php = 20
hitroll= nil 
ardamage = nil
orcdead = false
playerdead = false
playerrun = false
orcatk = nil
orcdmg = nil
orcturn = true
puts 'OMG! It\'s an orc!!!'
while orcdead == false and playerdead == false and playerrun == false
 sleep 1
 puts 'What do you do? (Run, Attack, or Look) (Look does not take a turn)'
 response = gets.chomp.downcase
    if response == 'attack'
      hitroll = rand(20) + 1
        if hitroll > 10
          ardamage = rand(6) + 1
          sleep 1
          puts 'You hit the orc!'
          sleep 1
          puts 'You did ' + ardamage.to_s + ' damage!'
          orchp = orchp - ardamage
          if orchp <= 0
            sleep 1          
            puts 'The orc has fallen!'
            orcdead = true
            orcturn = false
          end
        else
          sleep 1
          puts 'You missed!'
        end
        if orcturn == true
          orcatk = rand(20) + 1
          if orcatk > 15
            orcdmg = rand(6) + 1
            sleep 1
            puts 'The orc struck you for ' + orcdmg.to_s + ' damage!'
            php = php - orcdmg
            if php <= 0
              sleep 1
              puts 'You have fallen!'
              playerdead = true
            end
          else
            sleep 1
            puts 'The orc missed!'
          end
        end
    elsif response == 'run'
      sleep 1
      puts 'You ran away!'    
      playerrun = true
      orcturn = false
    elsif response == 'look'
      sleep 1
      puts 'The orc has ' + orchp.to_s + ' HP left!'
      sleep 1
      puts 'You have ' + php.to_s + ' HP left!'
    else
      puts 'Invalid command.'
    end
end