Subnautica is another game i absolutely love. i completely get how that triggers thalassophobia. Some of the areas would give me a pit in my stomach when exploring them.
Very excited for the 2nd one
100% the same for me, everytime i get to a new area or fight a new enemy i'm just blown by how unique it all feels.
the atmosphere is incredible and the music is amazing.
if anyone is a fan of dungeon crawlers, i 100% recommend dead cells it's perfect
I think having a nice melodic tune in the background for ambience is always nice. Dead Cells does their music really well, it always feels like it fits exactly to the scenario you're in
Minecraft is definitely one of my top options. God knows how many hours I've spent in various modpacks.
Fallout: New Vegas is also definitely up there, the DLCs and mods made for that game are incredible.