Birb

local vel, x, y = 1, 13, 10
local pX, pYo, pYf = 26, 1, 5

function Paint()
    term.clear()

    paintutils.drawFilledBox(1,1,26,20,colors.white)

     -- Birb
    paintutils.drawPixel(x,y,colors.orange)

    PipeGen()
end

function Physics()

    if (x==pX and (y<=pYo and y>=pYf)) then
        error("You loose",0)
    end

    y=y+vel
end

function PipeGen()
    paintutils.drawLine(pX,1,pX,pYo,colors.green) -- Top pipe
    paintutils.drawLine(pX,pYf,pX,20,colors.green) -- Bottom pipe

    pX=pX-1
    if (pX<=0) then
        pX = 26

        local r = math.random(2,18)
        pYo = r-2
        pYf = r+2
    end
end

-- Main --
while(true) do
    parallel.waitForAny(function()
        Physics()
        Paint()
        sleep(0.5)
    end,
    function()
        os.pullEvent("key")
        y=y-2
    end)
end