relatively new to the 40k lore. mechanicus was my introduction, the voice acting and dialogue perfectly captured the mechanicus clan and personalities. you can feel a resemblance of humanity in their mechanoid bodies. not too familiar with space marines outside of Dawn of War and the tcg games where they are constantly shouting cliche military slogans
Doki Doki Literature Club & Danganronpa Trilogy got me into VNs. I’m also playing Digimon Survive, games by Spike Chunsoft, & anime VNs (Evangelion, Death Note). PSP & DS era seem to have a lot