Download the assets for the game here
Drag and Drop your assets in your res:// folder
In Project => Project Settings => General
Locate the Rendering section
Set the Default Texture Filter to Nearest
This keeps edges sharp for pixel art
Project => Project Settings => Input Map
Type the name of the action and press +Add or hit enter
Then hit the + next to each action and press the key you want to link to that action
If you have a controller you could also set it up here
In Project => Project Settings => General => Physics => 2D Set Default Gravity to 0
Since this game is set in the vacum of space