Most games back then where small. An C64 only had 64k and most game didn't use all of it. An Atari 800 had max 48k. It wasn't until the 1200 that it went up. Both systems are cartridge based games, many of which were 8k.

Honestly though, I don't read much into the sizes. Sure they were small games and had lots of game play for some defintion of game play. I enjoyed them immensely. But it's hard to go back to just a few colors, low-res graphics, often no way to save, etc... for me at least, the modern affordances mean something. Of course I don't need every game to look like Horizon Zero Dawn. A Short Hike was great. It's also 400meg (according to steam)

The modern classic, Animal Well, is only 35mb in size!

https://store.steampowered.com/app/813230/ANIMAL_WELL/

>But it's hard to go back to just a few colors, low-res graphics, often no way to save, etc... for me at least, the modern affordances mean something.

All those old games have a way to save now, if you run them in an emulator as is commonly done these days. That's how I played through Metroid and finally beat the mother brain in just a day or two during the pandemic.