My problem : on my browser (http://localhost/tuto/), no "Hello !", or something like that, but part of the index.php source code. I also tried with a new project ("phalcon project proj-name") : same problem.
It's my first try, so I don't know if it's an install problem or another problem. Install was not easy (Ubuntu 16.04, Apache 2.4.18, PHP 7.0, Phalcon DevTools 3.2.8, cphalcon 3.2.4). Known trouble with php 7, as I read.
I tried "print_r(get_loaded_extensions());" and "php phpinfo();". Seems to be OK.
Thank's for any help !