Man, I have just put another 25-30 hours into Soulstone Survivors. The amount of content on this game is pretty deep, with skill trees for each character now past level 40, and three weapons to craft for each one. The amount of workable build diversity is pretty broad.
I will say once you get to curse level 4 the game becomes a chaotic mess of just avoiding ground effects while hoping your skills are whittling down the bosses. And by the time your skills get really powerful the cover the screen AND all the ground effect warnings and you can't even dodge damage properly. I cannot find an opacity meter to adjust either.
It is the priciest of the bunch, I think, but I have 52 enjoyable hours in it so definitely worth it.