Mortal Shell was pretty good and can be had for less than $5 pretty frequently. It's not as long as a lot of other Soulslikes but has some interesting mechanics.
I really intensely disliked mortal shell. I can tell it's a love letter to dark souls - all the styling is trying very hard - but the gameplay just pisses me off. Especially that first probably-optional boss that you have to parry like 30 times to beat.
It's always interesting to me talking about this game too Souls fans. I have never really found enjoyment in any of the Dark Souls games but, I've dropped probably a couple thousand hours at this point into Bloodborne and I have a feeling that may be why Mortal Shell clicked with me a little better than some of the other stuff like the surge or Lords of the fallen.
Either way, it's fantastic that we have such a bounty of these types of games to choose from right now.
I personally didn't like it. It's very easy to get lost, there are very few checkpoints, and the gameplay is just a bit too clunky. Maybe the latter two improve later on, but it lost my attention before that.