Well Bloodborne is made by the same developers o: Sekiro as well o: But those are more of their own thing than actual souls games. I don't know that much about the surge but I currently own Lords of the fallen! I just can't play it on my trash pc, lol.
Also I've only played DSI and DSII (Whish is absolutely trash compared to the first one or the third one even.) But hey, people seem to like this genre a lot! That's why some many games akin to the Soul series come out!
Also I'm not one of those that relates anything hard to Dark souls, lol. Cuphead was made to be tough, and Crash just suffers from old design choices but that doesn't it's a bad game!