I loved them all, but if I had to choose
Descent 2 > Descent 1 > Descent 3
3 was a well done transition into a new type of game engine. Good advancement of the story. Worth playing if you are a fan of the first 2. Felt like the developers cared for and stuck to the vision.
Eyeballing looks like the house couldn’t be more than 18x30 feet, or ~540 sq ft. Probably less in reality. Tiny home territory. Smaller than most single wide trailer homes. The doors as drawn must be for hobbits. Fun picture just the same. I love the urban homestead explosion and hope it never stops.