I always love it when someone does something awesome in Perl, but always a little scared to see the code :-(
A sad thing here is that the code looks like it mostly would run under strict and warnings, and it'd be pretty easy to simplify the sub definitions at the start
Strict is not that big of a deal and can be easily enabled later. Seriously, those issues with the code are really tiny and very unimportant, especially for this project. But I would definitely choose this kind of code over anything with Moo* for example.
It's sad that people don't know or forget what makes a code easier to understand and how important it is.
A sad thing here is that the code looks like it mostly would run under strict and warnings, and it'd be pretty easy to simplify the sub definitions at the start