Whenever I see someone describe how small something they've written as a replacement for a big library is, I wonder what they've discarded in order to get it so small.
Normally it's backwards compatibility, but in this case it appears to be "everything".
I don't get it...this is a simple library that people can use without bringing in external dependencies. Of course it won't be as functional as React-Router - that goes without saying!!
I would say that a router that doesn't support url patterns, query parameters or state is basically useless for anything other than small static sites that in my personal opinion shouldn't have clientside routing.
This is a nice demonstration of how routers can work for people that are curious, but I would have a lot of concerns about it as production-worthy, especially because you're manually firing browser native events during periods that people generally wouldn't expect them to fire.
I'm saying this as someone that had to write a full clientside routing system for a bespoke web app - routing is very hard and full of edge cases.
Normally it's backwards compatibility, but in this case it appears to be "everything".