quick dumb lua/love2d script, keyboard and mouse controls and a bouncy ball

bounce.lua

-- built for love

ball = {
  x = 400,
  y = 100,
  r = 25
}

paddle = {
  w = 100,
  h = 20,
  y = 500,
  x = 400
}

bounce = 0
momentum = 0

function love.update(dt)
    if love.keyboard.isDown("left") then
      paddle.x = paddle.x - 200 * dt
    end
    if love.keyboard.isDown("right") then
      paddle.x = paddle.x + 200 * dt
    end
  
  if mx~=love.mouse.getX() then
    mx = love.mouse.getX()
    paddle.x = mx
  end

  if(bounce > 0)then
    ball.y = ball.y - (200 * dt * bounce)
    bounce = bounce - .3 * dt
  elseif(
    ball.y+ball.r>paddle.y
    and ball.y+ball.r<(paddle.y+paddle.h)
    and ball.x+ball.r>paddle.x
    and ball.x+ball.r<(paddle.x+paddle.w)
  )then
    bounce = 1.2
    momentum = 1
  elseif(ball.y > 550)then
    ball.x, ball.y = 400, 100
  else
    ball.y = ball.y + (200 * dt * (1 - momentum))
    if(momentum>0)then momentum = momentum - .3 * dt end
  end
end

function love.draw()
    love.graphics.circle( 'fill', ball.x, ball.y, ball.r )
    love.graphics.rectangle( 'fill', paddle.x, paddle.y, paddle.w, paddle.h )
end