application unreachable from any external IP

Hi to all!
I got an issue with nginx - I'm unable to set it up correctly to be reached from outside the VPS.

I'm setting up searx: https://github.com/asciimoo/searx and, at a certain point of its installation steps it specifies a sample configuration for nginx:

server {
listen 80;
server_name searx.example.com;
root /usr/local/searx;

location / {
include uwsgi_params;
uwsgi_pass unix:/run/uwsgi/app/searx/socket;
}
}

I pasted it in /etc/nginx/nginx.conf (since the file mentioned in the installation guide did not exist and was not read by nginx), and everything works - but visible only from localhost.

What could be causing this kind of issue?

P.S. my current config is this: http://sprunge.us/UKdX