Can the player's screen resolution be changed?

I want to lower the player's resolution to give my game a retro look, I tried changing it using

game.Workspace.CurrentCamera.ViewportSize.X = x
game.Workspace.CurrentCamera.ViewportSize.Y = y

and nothing happens.

https://devforum.roblox.com/t/pixelated-effect-using-viewportframe/611997

I came across this really cool pixelated effect that uses viewport frames that you might find useful.