What I would really like to see is something like Temple of Elemental Evil/Ruins of Myth Drannor in the Solasta engine (i.e. a game that is essentially one huge dungeon crawl). Are there are any good user-created scenarios that have done this?
Try
Artyoan 's Forsaken Isle and Morrows Deep modules if you have not yet.
They are not pure dungeon crawls, but very combat focused.
And encounters are way harder then most battles in the base game.
Right now I'm stuck at the battle with the Cube of Death and a million of skellies.
I tryed using choke points, but the Cube casts Lightning Bolts through walls.
I tryed rushing the Cube, and even thought I'm about to turn the tide, but then 2 (two!) more Cubes spawned with more skellies.
I'll get back to it before long, haha.