So the secret forth Echo Night (First Voyage) was a part of a psp "game" called AdventurePlayer which was a toolkit for people to make their own adventure games on the psp.
It feels much more like a tech demo that re-uses some backgrounds as still images from the first Echo Night, but has all new ghosts to talk to and solve their problems so at least that isnt a complete repeat. Its about 2:30 hrs and is a pretty standard point-n-click adventure game.
However, it contains a lot of tedious pixel hunting and with a cursor controlled by a joystick, it's very annoying esp since there is often no visual indicator where you should be clicking. There are also several instances where you have to examine the same spot more than once to get an item, but it the game doesnt indicate you should do so.
All and all its pretty forgetable and not really worh it unless you are a competionist or have a very high tolerance for mediocre/bad point-n-click games