New Twiddle

components.game-defender.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.game-enemy.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.game-field.js

import Ember from 'ember';

export default Ember.Component.extend({
  mouseMove() {
    this.set('position', {key: 'val'});
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.field {
  color:white;
  background: black;
  width: 300px;
  height: 300px;
  position: relative;
}

.defender {
  position: absolute;
  height: 4px;
  background: blue;
  width: 20px;
  bottom: 0;
}

.enemy {
  position: absolute;
}

templates.application.hbs

<h1>Welcome to Invaders</h1>
<br>
<br>
{{game-field}}
<br>
<br>

templates.components.game-defender.hbs

{{yield}}

templates.components.game-enemy.hbs

{{yield}}

templates.components.game-field.hbs

<div class="field">
{{position.key}}
{{yield}}
</div>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}