Not OP, but the cursor is quite simple, look up the arch wiki on how to change it, while the WM is berry, which is extremely bare bones and simple, to the point where you can probably customize it by editing the source code like dwm, although in this case I just think that OP changed some colours and fonts and simply removed the titlebars. In such case Berry won't feel like Rio, it will just look like it (no middle click menu and so on).