Shin'en is a tiny studio. I think it's less than 10 people. I'd love for Nintendo to have them tho. They are wizards with Nintendo hardware.
Shin'en is just 5 guys.
And yeah they work absolute black magic with the results they manage to get from Nintendo's hardware; Iridion 3D on GBA, Jett Rocket on Wii, Nano Assault on 3DS, and Fast Racing Neo on Wii U for example.
If Nintendo owned Shin'en then we just might get them to finally make a new F-Zero.
The Wii games are their biggest success in pulling wizardry. Not just the hardware but they had a size limit of 40MB. I don't even know of a PS1 or Saturn game that small. I think even the early 90s arcade ports on those systems are 100MB at least lol.
Where they've shined the most so far has been with Punch-Out on Wii, and now Luigi's Mansion 3, which might even be their best selling game. :)