One of answers to Ruby Warrior. RubyWarrior https://www.bloc.io/ruby-warrior/

rubywarrior.rb

class Player
  def play_turn(warrior)
    if @health.nil?
      # initialize if needed
    end
    
    if warrior.feel.empty?
      if warrior.health < 20
        if @health <= warrior.health # not taking damage
          warrior.look.each.with_index do |s,i|
            if s.empty?
              if i+1 < 3 
                next
              else
                warrior.walk!
              end
            elsif s.enemy?
              warrior.shoot!
              break
            else
              warrior.rest!
              break
            end
          end
        else # taking damage
          if warrior.health < 10 # dameged enough to escape
            warrior.walk! :backward
          else
            warrior.walk! :forward
          end
        end
      else # enough to act
        spaces = warrior.look
        spaces.each.with_index do |s,i|
          if s.stairs?
            warrior.walk!
            break
          elsif s.empty?
            if i+1 < 3 
              next
            else
              warrior.walk!
            end
          elsif s.captive?
            warrior.walk!
            break
          elsif s.enemy?
            warrior.shoot!
            break
          else
            warrior.walk!
            break
          end
        end
      end
    elsif warrior.feel.captive?
      warrior.rescue!
    elsif warrior.feel.wall?
      warrior.pivot!
    else
      warrior.attack!
    end
    @health = warrior.health
  end
end