I really wanna know the inner workings of what and how this game is running the way it is... it's so impressive from a technical standpoint.
Shin'en is a long-time specialist on Nintendo hardware, and they use their own toolkits. It's a team that has also worked together for a very long time, and they have their roots in the PC demo scene.
Based on their interviews, they are probably the indie developer that has gone the deepest in their knowledge of both the GPU and CPU capabilities.
Another thing is that Nano Assault Neo was apparently pretty unoptimized and running on only one CPU core, while FRN is highly optimized (and presumably running multi-core). In FRN, they seem to use VSync+triple buffering to handle any stalling issues that might appear.
Most developers nowadays (regardless of platform) never do the optimization work that Shin'en does. (Other developers want their code to be easily portable and blame the hardware instead.)
Yes! How many gigs and how much!?!
Storage-wise, the Shin'en games are usually very small, specially compared to Unity-based games.
Wait, is this game 1080p? I know it's 60 fps, but I assumed it was 720p.
It's 720p/60fps. They said they could render it for 1080p, but they would have to remove so many effects to get it to work that the end result wasn't worth it.