Space Invaders

    ship has
    scale 5 2 appearance sprite.ship
    extent 1 1 category [ship]
    motorAxis gamepad.leftX motorSpeed 10 0 shootButton gamepad.south
    deathSensor detect [alien shipProjectile] goodness
    gunCreation entity.bullet creationVelocity 0 30 gunOffset 0 1.6
    velocity 0 0.

    alien has
    scale 9 4 appearance sprite.alien
    extent 1 1 category [alien]
    mass 1
    deathSensor detect [ship space shipProjectile] hiveSensor detect [wall]
    flipSensor detect [wall] gunCreation entity.bullet creationVelocity 0 -30
    gunOffset 0 -2.6
    worth 10
    evilness hive gun
    relegation 0
    promotion 1.

    ufo has scale 5 2 appearance sprite.ufo
    mass 1 extent 1 1 category [alien]
    deathSensor detect [shipProjectile] scapeSensor detect [wall] worth 500.

    bullet has
    scale 1 1 appearance sprite.bullet
    extent 1 1 deathSensor detect [alien shipProjectile evilProjectile wall
    space defense]
    team [single]
    category [shipProjectile] mass 1.

    goodBullet based on bullet has
    category [shipProjectile].

    evilBullet based on bullet has
    category [evilProjectile].

    space has
    scale 100 4 appearance sprite.space
    extent 1 1 category [space].

    wall has
    scale 4 100 appearance sprite.wall
    extent 1 1 category [wall].

    defense has
    scale 11 11 appearance sprite.defense
    extent 1 1  trigger 1 category [defense]
    deathSensor detect [shipProjectile evilProjectile alien].

    hiveMind has
    requiredEntities 1
    requiredGoodness 1
    scene entity.menu
    autoSpeed 5 0
    autoSpeedRatio 1.1
    flipFactor -1
    gunTimer 1s
    gunTimerRatio 0.9
    probabilityRange 0 1
    probability 0.5
    ufoTimer 10s
    bonus entity.ufo
    bonusSpawnPoint -40 40
    bonusVelocity 10 0.

    board has
    scale 5 10,
    team [single], number 0.

    audioEffect has
    audioClip audio.yay, lifetime 5s.

    player has rotation 0 0 10,
    viewDistance 1000, viewAngle 50, position 0 0, clearColor 0.5 0.5 0.5 1.

    hud has
    canvas 100 100 contains
        score based on board has position -40 40.
    .

    menu contains
        hud has canvas 100 100 contains
            title has position 0 10, scale 100 10, text 'Space_Invaders'.
            subtitle has position 0 -20, scale 100 5, text 'Press_Start'.
        .
        trigger has detector gamepad.start, scene entity.playground.
        player based on player.
    .

playground contains
    ship based on ship has position 0 -40.
    topSpace based on space has position 0 50.
    bottomSpace based on space has position 0 -50.
    leftWall based on wall has position -50 0.
    rightWall based on wall has position 50 0.

    alien based on alien has position 0 0 relegation 0 promotion -1.
    alienB based on alien has position -20 0 relegation 1 promotion -1.
    alienC based on alien has position -40 0 relegation 2 promotion -1.
    alienD based on alien has position 20 0 relegation 3 promotion -1.
    alienE based on alien has position 40 0 relegation 4 promotion -1.

    alienFather based on alien without gun has position 0 10 relegation 5
    promotion 0.
    alienBFather based on alien without gun has position -20 10 relegation 6
    promotion 1.
    alienCFather based on alien without gun has position -40 10 relegation 7
    promotion 2.
    alienDFather based on alien without gun has position 20 10 relegation 8
    promotion 3.
    alienEFather based on alien without gun has position 40 10 relegation 9
    promotion 4.

    alienGrandpa based on alien without gun has position 0 20 relegation 10
    promotion 5.
    alienBGrandpa based on alien without gun has position -20 20 relegation 11
     promotion 6.
    alienCGrandpa based on alien without gun has position -40 20 relegation 12
     promotion 7.
    alienDGrandpa based on alien without gun has position 20 20 relegation 13
     promotion 8.
    alienEGrandpa based on alien without gun has position 40 20 relegation 14
     promotion 9.

    hiveMind based on hiveMind.

    defenseA based on defense has position -33 -20.
    defenseB based on defense has position -11 -20.
    defenseC based on defense has position 11 -20.
    defenseD based on defense has position 33 -20.

    player based on player.
    canvas based on hud.
    .