Hello Google, want to compete with AWS?
Try unblocking ports 25, 465, and 587 so people can send emails from an instance, in my case I wanted to send an email from website contact form, didt it work no. https://cloud.google.com/compute/docs/tutorials/sending-mail/
Also while your at it how about allowing a valid server name like server1.example.com but you don't allow dots so you have to have server1examplecom
And how about the ability to assign additional IP's to an instance with-out using a command line.
Or get IPv6 up and running on your infrastructure.
I could keep going really.
AWS, used your service as well customers support took 6 days to get back to me and never sorted the problem out, nothing worse than being sent a written instructions script back, even when you explained that the issue is a bug on your side and you have included screen captures.
My advice to anyone is look around, DigitalOcean and LINODE might be a good place to start.