I'm really glad you're enjoying it. We wanted to keep this sub genre alive cause it meant so much to us when we were younger :D
My first experience was watching an older person play through Shadowgate at a house party. I was just a kid but others sat around and watch the guy go through it. We were all captivated. I loved the cryptic puzzles, creepy isolated vibe, and how the castle became deeper and more mysterious. *spoiler* In Infested, I was just killed by the pilot and didn't see it coming. That is also a major element I think you nailed.