This is especially true for the NES due to tools like NESMaker http://makenesgames.com/

There are so many new NES games now it's impossible to stay on top of it all.

See eg http://morphcat.de/micromages/

I remember seeing this video on that about the clever compression tricks used to cram the sprites and map layouts into 40K.

https://www.youtube.com/watch?v=ZWQ0591PAxM

And stuff like the SA-1 port of Gradius 3. Fixing the crippling slowdown of the original SNES version by using an enhancement chip from later SNES games.

https://arstechnica.com/gaming/2019/05/28-years-later-hacker...