As a place to start, here is what I think is a well curated list of top titles for many retro systems including the SMS and Genesis.

https://archive.org/details/retro-roms-best-set

Been using Wyze camera’s (Cam OG) for 2+ years. If you load an sdcard into the camera it does store locally, overwriting the oldest footage as it goes. You can then browse the footage on the sdcard and save as a video file via the app. I’ve done 20+ minute captures of the local wildlife and uploaded to YouTube without issue.