I might have a look, is it better than No Man's Sky?
It's more of a builder than No Man's Sky(aside from all the new base building stuff in NMS, though that is more modular system than voxel unit based), and the voxel nature/interactivity of the world itself it is a bit more relevant to gameplay than NMS, minus all the wildlife, not it's strongpoint/focus. The focus is mostly on vehicle building, slanted mostly towards space vehicles, but also ground vehicles and atmospheric flight. Also decent for some types of buildings, but mostly like space stations and capital class ships, especially now that they finally added some interior decoration. The mining is interesting, fun now that I have a reason to in my survival game, no real point in creative, except to get H2 for hydrogen thrusters(most powerful and work in both space and atmosphere). Some of the ores are rare, but you get little bits from meteor strikes, find boulders of some, and eventually find deposits using an ore finder, or in space as deposits on asteroids, again more relevant, very much actually in survival vs creative. Building blocks are in 2 sizes, 2.5 meters(7.5 ft) for big blocks and .5 meters(18 in) for small blocks. The 2 scales don't mix easily, directly but can be done.
The mining can get really hardcore, in my survival game I've been building a huge station in an earth-like planet arctic tundra plain and just finished running my second large-scale rotary mine. The drill heads are about 7.5 ft wide by 22.5 ft long, each. This massive drilling machine had 18 of those badboys in a beam mounted to a rotor at the center. All of that was attached to 2 pistons that expanded 30 feet each. I had to notch it by 1 meter per piston after drilling each layer. The first 20-30 feet were ice(why the tundra env is good), that fed into O2/H2 generators, which I am storing in massive banks of giant tanks, to service(hydrogen fuel and O2) all kinds of ships we build. The next 30-40 feet are stone, that gives me iron, nickel, and silicon.. tons of it. So now I have this 350+ foot hole that is 60 ft deep I'm turning into a hangar in which I can build a comfortably large spaceship for long missions, there are multiple planets in my local solar system I've yet to explore. The first rotary mine resulted in a hole just as big, but twice as deep, 4 pistons. I now have more materials and fuel than I know what to do with... well actually. Expanding/finishing the base plus a significantly sized capital ship with atmospheric/high gravity capabilities and hangars filled with lesser small block ships are now a possibility, and will use tons of that up.
But it wasn't that long ago I could barely build a small cargo ship, or my neat ore scouting vehicle. All this in a survival mode, though there is no thirst/hunger, just O2 unless you have atmosphere(recommend starting on such a planet), and H2 for your jetpack, which you
don't want to run out of fuel for in many situations, which one tends to discover the hard way. There are not many POIs, at all, by default. Some worlds(and game modes) have enemy outposts, some mission stuff is decent, but the only decent enemies are other voxel based clan AI things, drones, ships, and turrets. The wolves and space spiders are kind of silly. Again the gameplay needs work still, but it's good enough now that I would actually recommend it, before not so much.
Some of the newest stuff is paid DLC, but only a couple bucks each, not 10-15. And that's only to create with it, you can still see it even if you don't own it. Most blocks and textures are available. I don't mind supporting them, keeps the new stuff flowing, and imagine I'll be doing the same for 7DTD content post gold

It also has a really large mod selection and community. I'm playing vanilla now, but have explored the mods before, there are tons, is a neat example of synching decently with the mod workshop from an in-game menu(main menu, game settings). As a dev I think you'd find it interesting in ways, mostly the world and voxel aspect. The physics and block damage can be fun, and also very unforgiving. You will crash your first ship or ground vehicle, probably the second and third too, but that's part of the fun and challenge of it. So making a solid vehicle, even your first semi-stable slap-together, comes with a nice feeling of accomplishment.