It's an older system, but still high-end. Ryzen 1700X, 32GB RAM, AMD Vega 64.
Okay, I got it to work. Now I can review it.
My first thoughts are that if you know that the loading time is going to take that long, you should put in an animated loading screen. It doesn't have to be fancy, it just needs to have something changing every few frames, just so that the player doesn't think that their whole system has frozen. Even if you have a giant warning about it, that doesn't guarantee that the player won't have a mini freakout before they read it.
I understand why it takes that long to load... your voxels are positively tiny! But I didn't know that the first time. It just made me hesitant to try it again so I could give you that crashpoint is all. I'm probably beating a dead horse by this point so I'll stop.
Once I got in and playing, it was a blast. When I started looking at objects and realizing that they were voxel based, I thought that was pretty cool. But it was when I realized that the only way I could easily interact with the environment was to blow it up with my gun which the developer had blessed with infinite ammo, that my lizard brain connected those dots and I proceeded to do the only course of action available to me.
I
TORE
IT
UP!
My unfettered id had utterly conquered my greater ego. The beast had been unleashed! I then spent the next five minutes of my life wantonly destroying every object within the bunker, as well as the bunker itself. The adrenaline coursed through my hunched-over nerdform. The experience of playing this piece of software had transcended mere gaming and lo, it has become therapy.
Five stars.