One small thing I'd recommend is making the world seed (and maybe other things) use case-insensitive base 64 instead of base 10
You can store more numbers in a smaller format using base 64 and its easier to write down for users. (could maybe use something custom too)
It'd made reading and writing seeds from things like YouTube videos a lot easier (if a lets-player shares their world seed or something) since a player would only have to copy down something like "4S25B9" instead of "29419219429194242"