Go to the arcade.makecode.com website and create a new project.

Arcade: How to create a new project

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Create a new Arcade project using the makecode.com website.

In this game you will control a spaceship that has to dodge and shoot asteroids that come flying at it.

Add the following code to create the spaceship sprite and use the sprite editor to design your spaceship.

Rename your sprite to spaceship.

let spaceship = sprites.create(img`
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . d d d . . . . . . . . 
    . . 2 2 2 1 1 1 d d . . . . . . 
    . . 2 4 4 1 1 1 1 1 d d . . . . 
    . 2 4 4 5 1 1 1 1 1 1 1 d d . . 
    2 4 4 5 5 1 1 1 1 1 1 1 1 1 d d 
    2 2 4 4 5 1 1 1 1 1 1 1 d d . . 
    . 2 2 4 4 1 1 1 1 d d d . . . . 
    . . 2 2 2 d d d d . . . . . . . 
    . . . . 2 d d . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    `, SpriteKind.Player)

Arcade: How to create a sprite in Arcade

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Click on the gray box in the sprite block to open the Editor. You can choose a sprite from the Gallery or you can paint your own sprite using the Editor.

Now add the following new code to control the spaceship with the arrow keys and set it so that it cannot go off the screen.

let spaceship = sprites.create(img`
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . d d d . . . . . . . . 
    . . 2 2 2 1 1 1 d d . . . . . . 
    . . 2 4 4 1 1 1 1 1 d d . . . . 
    . 2 4 4 5 1 1 1 1 1 1 1 d d . . 
    2 4 4 5 5 1 1 1 1 1 1 1 1 1 d d 
    2 2 4 4 5 1 1 1 1 1 1 1 d d . . 
    . 2 2 4 4 1 1 1 1 d d d . . . . 
    . . 2 2 2 d d d d . . . . . . . 
    . . . . 2 d d . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    `, SpriteKind.Player)
controller.moveSprite(spaceship, 150, 150)
spaceship.setStayInScreen(true)

Arcade is designed for programming games so there's lots of helpful blocks that we can use.

To set the number of lives you have at the start of the game, add the set life to 3  block.

let spaceship = sprites.create(img`
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . d d d . . . . . . . . 
    . . 2 2 2 1 1 1 d d . . . . . . 
    . . 2 4 4 1 1 1 1 1 d d . . . . 
    . 2 4 4 5 1 1 1 1 1 1 1 d d . . 
    2 4 4 5 5 1 1 1 1 1 1 1 1 1 d d 
    2 2 4 4 5 1 1 1 1 1 1 1 d d . . 
    . 2 2 4 4 1 1 1 1 d d d . . . . 
    . . 2 2 2 d d d d . . . . . . . 
    . . . . 2 d d . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    . . . . . . . . . . . . . . . . 
    `, SpriteKind.Player)
controller.moveSprite(spaceship, 150, 150)
spaceship.setStayInScreen(true)
info.setLife(3)