I really hope the game is selling well, it's hard to judge from outside but there doesn't seem to be as much talk across the internet as I'd like. I have my fingers crossed for a Steam version (DRM-free, please devs?) just for the sake of future-proofing it beyond the life of the PS4. I know that's way ahead of us but there are some games you just never want to lose.
I'm also waiting for the corruption fix before diving into the level editor. That seems to be what set the bug off for a bunch of people so I'm too paranoid to even try just yet.
Reviews, on the whole, have been positive, but it's still not hard to find criticisms like how it looks "dated" or might appear too simplistic for some people. Some people have slammed the metacritic user ratings with 0s because it doesn't have the online MP from older titles as well. (That's not really fair, IMO.)
The other thing is that it's been a busy month for smaller games, and stuff like Rocket League and DOTA2 TI kind of dominated social media channels and news coverage the last week or so. I almost feel like being part of the PLAY promo did them favours, but it also sandwiched them between several other high profile indie launches on PS4.
N++, IMO, is a game that unless you play it or know of its reputation from past entries, you might not give it a chance. That's a really tough thing to deal with. I really hope it's been selling decently. The free content update is still coming that's supposed to effectively double the amount of content, so that's (hopefully) going to provide more news coverage for them whenever it drops. Hopefully bigger outlets like Polygon will review it then, since they didn't when it first came out.
On that point, I feel like not getting release day reviews from key outlets like Polygon, Game Trailers, IGN NA, and Kotaku denied Metanet key coverage and exposure in the mainstream. (To be fair to them, they did do some pre-release coverage, but I'm of the mind that post-launch coverage is more important since a potential customer can action on their desires and make a purchase and play right away -- instead of waiting until release and potentially forgetting or spending their allotment for that month/year on other games or entertainment while they wait.) I'm speculating that a game like N++ might be hard to pitch reviews for since some EICs might feel the entire game needs to be completed (All 2200+ levels? Hah!) before a review can be published -- but there's no way that was the case for smaller blogs
that did review N++. I've actually gone so far as asking Arthur Gies on twitter if a review was planned from Polygon, but I haven't received a response.