LÖVE

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game.lua:17: bad argument #2 to 'rectangle' (number expected,
 got nil)

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-- main tables

platform       = {}
player         = {}
enemy          = {}
  
  -- enemy controller tables
  
enemies                    = {}
enemies_controller         = {}
enemies_controller.enemies = {}
  
  -- enemy bullet tables
  
  enemy.bullets  = {}
  enemy.cooldown = 30
  enemy.fire     = function()
    if enemy.cooldown <= 0 then
      enemy.cooldown = 30
      bullet = {}
      bullet.x = 35
      bullet.y = 273
      table.insert(enemy.bullets, bullet)
    end

-- some assets/music

background_image = love.graphics.newImage('assets/backgrount.png')
 --                                                        ^ typo ¯\_(ツ)_/¯
enemy.fireSound = love.audio.newSource('sfxmusic/shoot.wav')

 gameover = false
 
 -- Collision
 
function checkCollisions(enemy, bullets)
  for _,e in pairs(enemy) do
    for _,b in pairs(bullets) do
      if b.y <= e.y + e.height and b.x > e.x + e.width then
         gameover = true
      end
    end
  end
end

-- platform

platform.width = love.graphics.getWidth()
platform.height = love.graphics.getHeight()
 
platform.x = 0
platform.y = platform.height / 2
 
 -- player tables
 
player.x = love.graphics.getWidth() / 2.05
player.y = love.graphics.getHeight() / 2.05
 
player.speed = 300
 
player.img = love.graphics.newImage('assets/sprite.png')
 
player.ground = player.y     -- This makes the character land on the plaform.
 
player.y_velocity = 0        -- Whenever the character hasn't jumped yet, the Y-Axis velocity is always at 0.
 
player.jump_height = -300    -- Whenever the character jumps, he can reach this height.
player.gravity = -500  

--Enemy
  
enemy.x = love.graphics.getWidth() / 2.05
enemy.y = love.graphics.getHeight() / 2.05
  
enemy.img = love.graphics.newImage('assets/sprite2.png')
  
enemy.ground = player.y
 
enemy.y_velocity = 0
-- enemy image/sprite

enemy.img = love.graphics.newImage('assets/sprite2.png')
  
function love.load()
  
  background_image = love.graphics.newImage('assets/backgrount.png')
  
  function enemies_controller:spawnEnemy()
  end
end
  
function love.update(dt)
    
  enemy.cooldown = enemy.cooldown - 1
  
  for i=10,1,-1 do 
    enemy:fire()
  end
  
  -- Bullet creator/cleaner (removes bullets off screen for memory saving)
  for i,b in ipairs(enemy.bullets) do
    if b.x < 10 then
      table.remove(enemy.bullets, i)
      end
    b.x = b.x + 4
  end
  
  -- Player controls
  
	if love.keyboard.isDown('d') or love.keyboard.isDown('right') then
		if player.x < (love.graphics.getWidth() - player.img:getWidth()) then
			player.x = player.x + (player.speed * dt)
		end
	elseif love.keyboard.isDown('a') or love.keyboard.isDown('left')then
		if player.x > 0 then 
			player.x = player.x - (player.speed * dt)
		end
	end
 
	if love.keyboard.isDown('space') or love.keyboard.isDown('up') then
		if player.y_velocity == 0 then
			player.y_velocity = player.jump_height
		end
	end
 
	if player.y_velocity ~= 0 then
		player.y = player.y + player.y_velocity * dt
		player.y_velocity = player.y_velocity - player.gravity * dt
	end
 
	if player.y > player.ground then
		player.y_velocity = 0
    	player.y = player.ground
	end
end
    
    checkCollisions(enemies_controller.enemies, enemy.bullets)
end

function love.draw()
  love.graphics.setBackgroundColor(100, 100, 100)
  
  if gameover then
    love.graphics.setNewFont(20)
    love.graphics.print("Game Over")
    return
  end
  
	love.graphics.setColor(0, 255, 50)
	love.graphics.rectangle('fill', platform.x, platform.y, platform.width, platform.height)
 
 love.graphics.setColor(255, 255, 255)
	love.graphics.draw(player.img, player.x, player.y, 0, 1, 1.5, 2.2, 32)
  love.graphics.draw(enemy.img, 1, enemy.y, 0, 1, 1.5, 1.6, 32)
  
  -- draw bullets
  love.graphics.setColor(255, 255, 0)
  for _,b in pairs(enemy.bullets) do
    love.graphics.rectangle("fill", b.x, b.y, 10, 5)
  end
end