90mb ram
If you're in a system where 256mb of RAM is the limit, sure - go for the RAM efficient OS options, they're out there.
Can you even buy less than 2GB of RAM in a desktop system anymore? Even the Raspberry Pi 5 starts at 2GB (and, yes, the older models have less, but I did say desktop system, implying: reasonable desktop performance.) Maybe if you feel the need to use a RasPi 3 as a desktop for something then you should dig around for one of your more efficient OS configurations, but I'll note... back when RasPi 3 was the new model, Raspbian came default without systemd, but offered a systemd option. The systemd option booted from power off to the desktop (such as it was) in about 1/3 the time.
One reality of the world is: the developers choose what hardware/OS configurations they target. If the makers of your game don't target your RAM efficient system, you're outta luck. Developers make their choices for their own reasons, but even with the ever-growing FOSS communities, the majority of developers work for a paycheck, that paycheck comes from profitable businesses and those businesses have very strong influence on what the developers work toward. The businesses only exist because they are profitable... FOSS may not be bound by those realities, but it lives in a world dominated by them.