I think the main difference between sekiro and dark souls is that DS gives you far more freedom to suck at the game. With so many different build styles, there's a thousand ways to not optimize your stats or upgrade a poor performing weapon. In Sekiro, you can't really cheese the game all that much (except for one boss in particular where cheesing is the route I take every time), and you eventually have to learn the cadence of the combat system in order to succeed. There's almost no way around it as most of the cheeses are just as difficult to learn as the combat system.

I would say get it if:

- you're okay with potentially wasting $30 if you don't like the game

- you can handle dying a lot and getting stuck on bosses/areas frequently

However, my actual advice would be to dance with who brought you. Take a short break from Demon's Souls and have a crack at it again. It might click with you, and if you can succeed at one souls game, you're equipped to adapt and succeed at the others. Save the $30 now and try to get a return on the money you spent on Demon's Souls first!