A trivial version of pong for the playdate

pong.lua

import "CoreLibs/sprites"
import "CoreLibs/graphics"

playdate.display.setRefreshRate(20)

local gfx = playdate.graphics
local spritelib = gfx.sprite
local screenWidth = playdate.display.getWidth()
local screenHeight = playdate.display.getHeight()


local playerOneY = screenHeight/2
local playerTwoY = screenHeight/2

local ballX = screenWidth/2
local ballY = screenHeight/2

local ballGoingLeft = true
local ballGoingUp = true

local function startGame()
end

function playdate.update()
	if ballGoingLeft then
		ballX += 2
	else
		ballX -= 2 
	end
	
	if ballGoingUp then
		ballY -= 2
	else
		ballY += 2 
	end
		
	-- collision player 1
	if ballX > 20 and ballX < 20 + 8 and ballY > playerOneY - 20 and ballY < playerOneY + 40 then
		ballGoingLeft = true
	end

	-- collision player 2
	if ballX > screenWidth - 20 - 8 - 4 and ballX < screenWidth - 20 + 8 and ballY > playerTwoY - 20 and ballY < playerTwoY + 40 then
		ballGoingLeft = false
	end

	-- score checking 
	if ballX > screenWidth then
		playdate.graphics.drawText("Congrats p1", 20, 20)
		return
	end
	
	if ballX < 0 then
		playdate.graphics.drawText("Congrats p2", 20, 20)
		return
	end

	if ballY < 0 then
		ballGoingUp = false
	end

if ballY > screenHeight then
	ballGoingUp = true
end
	
	-- clear the screen
	gfx.setBackgroundColor(gfx.kColorWhite)
	gfx.setColor(gfx.kColorWhite)
	gfx.fillRect(0, 0, screenWidth , screenHeight )
	
	-- draw ball
	gfx.setBackgroundColor(gfx.kColorBlack)
	gfx.setColor(gfx.kColorBlack)
	gfx.fillRect(ballX, ballY, 4 , 4 )
	
	-- paddle 1
	gfx.setBackgroundColor(gfx.kColorBlack)
	gfx.setColor(gfx.kColorBlack)
	gfx.fillRect(20, playerOneY - 40/2, 8 , 40 )
	
	-- paddle 2
	gfx.setBackgroundColor(gfx.kColorBlack)
	gfx.setColor(gfx.kColorBlack)
	gfx.fillRect(screenWidth - 8 - 20, playerTwoY - 40/2, 8 , 40 )
	
	
end



function playdate.leftButtonDown()

end

function playdate.rightButtonDown()
	
end

function playdate.downButtonDown()
	playerOneY += 5
end

function playdate.upButtonDown()
	playerOneY -= 5
end

function playdate.AButtonDown()
	playerTwoY += 5
end

function playdate.BButtonDown()
	playerTwoY -= 5
end

function playdate.AButtonUp()

end

function playdate.BButtonUp()
	
end