Why should someone use this over any other framework? And why aren't you using all the PSR standards?
Some PSR standards are taken into account, but not all of them. The goal is to provide simple to use and extendable framework that helps you do projects of any size.
Number of files isn't a useful metric because other microframeworks can be run without ever loading the router or any of the data storage classes. They could be run with less than 10 files loaded. And even then, it still doesn't matter because number of files just means number of classes, which doesn't say anything about the readability or simplicity of the code.