Judging from the landing page, it seems to be a file manager and not an alternative to tree(1). If so, another one that's also handy and shows you a preview of

Judging from the landing page, it seems to be a file manager and not an alternative to tree(1). If so, another one that's also handy and shows you a preview of the files one level up and down the directory tree is ranger(1) --- and it has vim keys which makes it extra great.