I mean, you're talking about games between 6-10ish years old. The standard for quite a few years now has been 8 gigs minimum, and while you can run integrated cards and achieve some success in older games, they will simply fall way off in comparison to a dedicated gpu designed to handle such tasks. An unfinished game such as this will be doubly so for requirements as they're unstable builds.
Are you on a laptop or just an old desktop? I'd be curious to see the actual website specs if it was a prebuilt.