when i test your page, it refreshes with the querystring variable invalid=true:
which means that validation has failed.
When validation fails, the email behavior is not executed which is why there is no redirect.
One issue i see is that you have replaced the Comments field with an HTML Editor instance that is not named Comments.
the validation is looking for a form element named Comments, but the HTML Editor instance is named editorField.
you will need to change the name of the HTML Editor Instance to Comments