It has been the game I've been generally most hyped for ever since it was first revealed 4+ years ago. I soaked up every detail about it until about 2 years ago when I decided to go on a quasi media blackout about it so that nothing would be spoiled for me and it would remain as fresh as possible for when I play it - to the extent that I chose to watch the E3 trailer with only my peripheral vision because I don't even want to really drink in and enjoy the visual style until my personal playthough. I've pretty much never gone to such lengths to protect my eventual experience of a game I'm excited about, so yeah, it's pretty important to me.
My hype has subdued slightly in the last 18 months because the vast myriad of possibilities of what I imagined the game could be from the outset seems to have reduced down and I've also in that time learnt of Jonathon Blow that he values and is excited by pure puzzle games probably more than I am, leaving me to worry that what he's clearly excited by with this game won't completely align with what I value most. If this game were only clever puzzle games I'd be disappointed to be honest. Given Jonathon Blow's own studied, careful game design and deep thinking I'm frankly expecting The Witness to say something about the human condition and/or the nature of the universe and that's why I value him more highly than many other game designers. (I don't want/expect this from every designer by the way but I'd love to see more games aim for these heights of exploration in addition to just the fun). So I'm a little bit cautious in my approach to thinking about it now, but I'm holding on to the fact that's he said that The Witness will be very spoilerable, which makes me think there's more than meets the eye about this game.