Looks cool. I haven't taken an in-depth look yet, but what I noticed is that when I press CMD+W it closes the whole window, rather than the tab I am in. This will land me in some trouble if I ever decide to use it as my main tool.
Yes that is a problem. The app should be capturing that event to close tabs, but MacOS takes it over for some reason. I'll be doing keyboard shortcuts differently soon, so that will be fixed.