This game is beautiful - despite being made up of, as you said, untextured cubes, the lighting and composition genuinely make it look gorgeous. I especially love the torches! Flames made of cubes. I'm on a mac and therefore could not download it, so I played in browser and struggled with the mouse. I opened a few chests, but if there was gameplay beyond that, I missed it. However, even just opening like 3 chests, it was pretty evocative of discovering treasure in an old space.