Yii2 save model to database

I'm trying to do simple CRUD application with Yii2, but when I'm trying to save data, no validation errors appears and $model->validate() returns false. Here's my code:

public function actionCreate()
{
    $model = new Game();
    if($model->load(Yii::$app->request->post()) && $model->save())
    {
        $this->redirect(['game-list']);
    }
    return $this->render('create', ['model' => $model]);
}

So, $model->load() returns true and here is my rules() in my model:

public function rules()
{
    return [
        [['title', 'subtitle', 'description'], 'required'],
        [['id_type', 'is_active', 'picture'], 'default'],
    ];
}

I have seven columns in DB (this 6 + id as a primary key). I will be glad if anyone help me.

UPD: View:

<? $form = ActiveForm::begin(array('options' => array('class' => 'form-horizontal'))); ?>
<?= $form->errorSummary($model); ?>
<?= $form->field($model, 'title')->textInput(); ?>
<?= $form->field($model, 'subtitle')->textInput(); ?>
<?= $form->field($model, 'description')->textInput(); ?>
<div class="form-actions">
    <?= Html::submitButton(Yii::t('app', $model->isNewRecord ? 'Create' : 'Update')); ?>
</div>
<? ActiveForm::end(); ?>