Create a new scene with Control as root

Rename it to HUD

Set the Anchors Preset to Full Rect

Add a Label node as a child

Rename it to LabelTime

Set the Text property to Time: 20

Set Horizontal Alignment to Left

Set Vertical Alignment to Centre

Add New LabelSettings

Expand LabelSettings

Set Font Size to 30px

Set Outline Color to Black

Add a Timer Node as child

Rename it to GameLengthTimer

Set Wait Time to 20.0s

Set One Shot to On

Set Autostart to On

Select the GameOverScreen

Set Anchors Preset to Full Rect

Select the FinalScoreLabel

Set the Text property to Final Score: 0

Add new LabelSettings

Expand

Set Font Size to 64px

Set Outline Size to 10px

Set Outline Color to Red

Add a Label node as child of HUD

Rename it to LabelScore

Set Text property to Score: 0

Add new LabelSettings

Expand

Set Font Size to 30px

Set Outline Color to Black

Remember to go back and 

Hide the GameOverScreen