There is almost no reason to want to go back to Hexx Ruins after beating it once
You don't need to go back to the Hexx Ruins to unlock Ick Swamp. Just play any dungeon until the Naga subdungeon appears. I found the sub-dungeon Den of Danger, for instance.
My limited unlock profile beat the game with about 4000 gold, and about 3500+ gold worth of stuff to unlock in town
Odd; on my limited unlock approach I beat the game without about 4000 gold and everything unlocked. I already had all my trophies by the time Gaan-Telet became available, too, so this was the earliest possible junction at which I could win.
Not sure how or if to fix this, but I just feel learning to play a pure spellcaster(even if they can/are overpowered) is hard.
I think it's fine that some strategies are harder to master than others. Especially with the Sorcerer so hard to mess up and the Bloodmage having such potential if you put the effort into mastering him, there's lots of leeway to learn to play casters (though bloodmage will need a nerf...)