Hi there! When you talk about the 'requirements' of the system, how deep does this go? Does it have to be small enough to fit on a game cartridge for that console? Does it have to use as little ram as needed to run on that console?  Or is it more of a visual restriction?

Rules say: "Your game must (loosely) follow the restrictions of the platform you’ve chosen."

So my reading if that is that the limitation decision is up to you. I suspect visual restriction will be the most common. RAM restrictions would be hard to implement on most modern systems.

I read as feel of the console

for example Gameboy:

• Resolution of 160*144 (upscaled to not be a postage stamp on modern screens)
• 8 buttons (4 directions, A, B, start, select)
• 2 bit colour

Pretty sure its just visual. I can't imagine they expect you to go that far out of your way to stay in theme. 

So Y'know, Dithering, Low poly models, Pixely textures, Bit crushed sound in some cases, That whole deal. 

Hope this helps! Good luck on the jam if You're participating!