...do SNES cartridges still can contain chips like the super FX? And if so, does the memory increase as is would without limitation?
If so, then the only limit would be the video output resolution/colour:
Other then that: limited audience, Middleware tools that it becomes piss easy to generate SNES assets and games, more and more the artstyles would shift over time.
Also, even with just the super FX there would be a couple genres of 3d games that would come up.
I don’t think creativity would be too much of an issue. There’s endless ground to explore in 2D games. Games would be way less popular though without new PC and mobile games.
Endless ground in 2d, but those also certain things.
Limited amount of sprites mean even a 2d warriors game can't show as many enemies, Mano jrpgs past the SNES need a fuckton of text for the Menüs, those Eiter devolve into a chore of menu diving and trying to find the element in the list or reduce complexity.
Something like ori simply coult not work since the scale of the world compared to ori would mean you loose to many crucial details and ori could only be like 4 pixels, and if you rescale it it's the same as Sonic on GBA: screen crunch.
There simply are limits that would make many modern 2d games unfeasible.
There still would be a ton of innovation. I just don't expect that game complexity would increase because of screen space and other lots.