Rust can compile to 32 Bit just fine, even if I use stuff like 128 Bit Integers, or similar.
And 4 Billion Entities that can be loaded at the same time is quite a lot. Minecraft doesn’t get above 1000 usually. The 2 GB of RAM limit might be an Issue with 32 Bit Stuffs, but I don’t think I will waste THAT much RAM on unimportant Stuff, things can be stored in Files just fine usually.
The Game is supposed to run on a Raspberry Pi 3B and a Raspberry Pi 4 (with 4GB RAM), so this should cover both 32 and 64 Bit ARM, and the Computer I use right now is 64 Bit Intel, and I also happen to own a 32 Bit Netbook that I cant manage to install Linux on for some reason (its a shitty Intel Mobile Processor from a Samsung NC10).
Lots of OS Compatibility is planned, except for Apple, fuck Apple, let those people compile it for their own Apple OS if they really want to. Unless the ARM Version happens to work for them with their new Processors, then “eh, but dont expect me to help much”.