These introduction screens actually load assets to make sure the player sees everything as it’s supposed to be.
If you just want to make a gui that appears for a certain amount of time then put a ScreenGui in game.StarterGui.
Then customize it however you want.
In a LocalScript do this:
game.StarterGui.ScreenGui.Enabled = true
task.wait(60)
game.StarterGui.ScreenGui.Enabled = false
If I was on PC i would probably show you how to make it exactly how you want, but currently im on Phone