Some cool answers from the Reddit AMA
On if N will get another sequel
Nope, N++ was designed to be the ultimate and final form of N -- we made sure make it a lifetime supply :
On the freeware games that inspired the original N
Soldat: vertical momentum accumulates, player has inertia
Super Bubble Blob: player can wallslide and wallclimb, levels are single-screen "puzzles"
Puchiwara no Bouken: player is a tiny stick figure in a giant single-screen tile-based world
Zone Runner: player collects gold and avoids enemies (this game made us realize that this was sufficient, you didn't need to add anything else (eg attacking) to make a fun game)
On favorite indie games (Snakebird and 868 Hack/Imbroglio shoutouts, Raigan has impeccable tastes)
Recently Hyper Light Drifter has amazed me with how well-designed it is, it's stunning in so many ways.
Teleglitch is another game that, like HLD, has a really coherent aesthetic and just feels well-realized in a way that soooo many indie games don't these days.
Ms. Pac Man, SMB3/SMW, Doom, Tetris.. I'm forgetting a lot but these are classics to me.
868-HACK and Imbroglio are astoundingly good games (IMO).
Snakebird is a masterpiece.
DoomRL is my favourite roguelike.
I'm definitely forgetting a lot of games, I feel bad...
On completing the game
You can probably speedrun them all in under 40 hours; getting all the gold should take about 100 hours; getting 100% in everything is unbounded ;)
The game was designed to play here and there, a bit at a time -- you can definitely binge it, but we think it's more fun to play an hour or two every night.
On the original plans for N
Honestly when we started, we were planning on making a slower-paced stealth game that involved sneaking around -- but once the physics and movement was implemented, we realized that being acrobatic and jumping around like crazy was way more fun than sneaking, so we changed direction.
On new projects post-N
In terms of new stuff, next month we'll be starting a new prototype but I can't really say anything about that yet We have a bunch of in-progress prototypes that we're really eager to get back to as well -- Robotology (which is sort of a love letter to Umihara Kawase, a really awesome physics-based platformer for Super Famicom) and Office Yeti (an homage to the fantastic ZX Spectrum game Skool Daze) are the two furthest-along, we've been sort of picking away at them but would really like to see if we can complete one of them.