Sorry, but I don't fully understand your latest comment. Let me try to clarify it.
If you launch WP from our launchpad (https://google.bitnami.com/) you could see something like this:
You cannot launch f1-micro instances because WP requires at least 700MB.
However, it is possible to do it from https://console.cloud.google.com/, but it is not recommended since you won't have memory enough to make it work properly. So the first issue you reported may be expected, taking into account the kind of instance.
Let me know if you have further doubts.