Any critical security vulnerabilities will be the fault of Google. This app is a glorified filepusher manipulating bash strings into standard path structures for google buckets.

Edit: to describe more precisely, it's a bunch of bash functions that manipulate a bash string for the commands gcloud storage ls and gcloud storage cp. It has some useful functionality beyond that, such as tracking projects and project versions for collaborative purposes, but this is a mask on top of existing commands.