rtcvb32: Yeah, go with hide... While there's some games i don't like in my library, hiding them gets them out.
Milo1988: Thanks, the game is a alpha, i´m not interested in library.
Presumably it can come out of alpha/beta stage one day, and it may even be a good game then (whatever the game is).
I would wait at least until when the game is officially finished to decide whether to keep it or remove it. Then again, it's not like it's doing you any harm when you keep it in the shelf, so why worry about it?
In fact, keeping it there might even be beneficial, as in some form of sales, mystery games and such, it won't be the mystery game that you receive, if you already own it.