I just got Cyube yesterday, and it's absolutely incredible, this already my favorite VR game of all time so far, and I honestly enjoy this even more than minecraft, which I've been playing for years, despite the unfinished state of the game. I especially love that the game has good modding support, and may actually try learning unreal to make a few mods of my own in the future. That being said, here's a list of some ideas I had that I think would be nice additions to the game in the future:

1: Technology would be a great feature, specifically ways of automating basic tasks, like crafting and mining, as well as a system to transport players, entities, and items. A way to store mass amounts of items and easily sort through them could also be done with a technology system, as well as ways to power the bucket and gloves wirelessly without having to constantly replace a used-up crystal. overall a technology system could make end-game life easier, and allow for massive and complicated creations, and the system could be easily expanded by mods.

2: Modded multiplayer; It would be nice if you could mod a world (after multiplayer is added ofc), and when someone joins that world, they can download the assets needed to see and use whatever mods are on that world, or they are given a prompt that lets them install the needed mods and restart the game with one click, which would make playing multiplayer with mods easy.

3: Server software would be nice, I'm not sure how you want multiplayer to work exactly, but I like the idea of being able to host a persistent server that people can join, kind of like how minecraft's multiplayer system works, this would also make use of the above suggestion so if a server has mods, people can easily download the needed assets upon join, or quickly install the needed mods.

4: Pets. A system for naming small animals (Like Bunnies and Salamanders), and keeping them as pets would be nice, you can already grab them and keep them, but a naming system and other pet utilities could be fun, as well as functional pets that can help you in some small way.

5: An improved inventory system is needed eventually, as otherwise it might end up having the same problem as minecraft. for early-game, you could be able to craft multiple tiers of backpacks, and end-game you could use a technology storage system to wirelessly transfer items to and from a storage system, which would completely eliminate any inventory issues. this would be a very end-game system though

6: multiple dimensions or worlds. This idea is probably a bad idea to implement early on, as the main world should be at least mostly finished first (better caves, at least 20-ish biomes, plenty of entities), but it would be nice to have other worlds to explore. I personally think a way to eventually advance to space travel and have other worlds be other planets would fit the progression style of the game more (if a technology system is added, otherwise alternate dimensions would work better), and other planets would allow for mods to easily add custom worlds, and it would mean different worlds could have different gravity levels to play around with, and you could possibly also be able to build in space, make space ships and things like that. With multiplayer a space system with multiple planets could end up being really fun. As I mentioned before though, this idea would probably not be implemented for a long while after the game is out of early access (if you even decide to implement the idea at all)

7: Small ideas: Food & liquid, also oceans would be nice, as well as a health/food/water bar, the bars could show up on the left wrist, requiring food & liquid to survive could be toggleable, and oceans would just be a great addition. (Edit: I forgot to add this but being able to hold tools with 2 hands and adjust your grip would be awesome and really increase immersion)

8: I promise this is the last idea, vehicles/rideable animals would be nice, perhaps even buildable boats and other vehicles, or system to allow dynamic full blocks and vehicle controls so mods can add cool moving stuff and vehicles easily