The Witness would have been better if it was half as long definitely, but the problem was not that it was long, it was that it didn't have enough interesting content to fill the time. The puzzles are not mechanically interesting enough to enjoy repeating to the level the game forces you to and the variations are explored so slowly it's just tedious.

I think Blow achieved what he wanted, which I guess makes it a good game in a sense but also it wasn't an experience I enjoyed or can easily recommend to others.