Basic Platformer Prototype source code ( by Urvorn )

-- Icon and title

Icon = love.image.newImageData("images/Monster.png")
love.window.setTitle("Basic Platformer Prototype")
love.window.setIcon(Icon)




function love.load()

  -- Window

  WindowWidth = love.graphics.getWidth()
  WindowHeight = love.graphics.getHeight()

   -- Character

  Monster = love.graphics.newImage("images/Monster.png")
  MonsterWidth = (Monster):getWidth()
  MonsterHeight = (Monster):getHeight()
  MonsterX = love.graphics.getWidth() / 2
  MonsterY =  love.graphics.getHeight() - 100
  MonsterSpeed = 400
  MonsterYVelocity = 0
  JumpHeight = - 500
  Gravity =  - 700

  -- Ground

  GroundX = 0
  GroundY = MonsterY
  GroundWidth = WindowWidth
  GroundHeight = WindowHeight - GroundY

  -- Platform

  Platform = love.graphics.newImage("images/Platform.png")
  PlatformWidth = (Platform):getWidth()
  PlatformHeight = (Platform):getHeight()
  PlatformX = 450
  PlatformY = love.graphics.getHeight() - (100 + PlatformHeight)

end

function love.update(dt)

  if love.keyboard.isDown("right") and MonsterX < (WindowWidth - MonsterWidth) then
    MonsterX = MonsterX + (MonsterSpeed * dt)
  elseif love.keyboard.isDown("left") and MonsterX > 0 then
    MonsterX = MonsterX - (MonsterSpeed * dt)
  end

  if love.keyboard.isDown("space") then

    if MonsterYVelocity == 0 then
      MonsterYVelocity = JumpHeight
    end

  end

    if MonsterYVelocity ~= 0 then
      MonsterY = MonsterY + (MonsterYVelocity * dt)
      MonsterYVelocity = MonsterYVelocity - (Gravity * dt)
    end

    if MonsterY > GroundY then
      MonsterYVelocity = 0
      if MonsterY == PlatformY and MonsterX >= PlatformX and MonsterX <= (PlatformX + PlatformWidth) then
      MonsterY = PlatformY
      else
      MonsterY = GroundY

     end

    end




end
function love.draw()

  -- Character
  love.graphics.setColor(1,1,1)
  love.graphics.draw(Monster, MonsterX, MonsterY, 0, 1, 1, 0, 32)

  -- Background

  love.graphics.setBackgroundColor(.5,.5,.5)

  love.graphics.setColor(0,0,0)
  love.graphics.rectangle("fill", GroundX, GroundY, GroundWidth, GroundHeight)

  -- Platform

  love.graphics.setColor(1,1,1)
  love.graphics.draw(Platform, PlatformX, PlatformY)


end