Your review also mentions Steven King's Gunslinger/Dark Tower as a setting. I had this thought myself and have also seen other folks mention it. I think it's a great idea!
Would it be an idea you would consider for a next product of yours?
Personnaly, I would well see it also reminding of Dark Sun, where the world's ambiance is concerned, but with gunslingers instead of templars... Otherwise, it seems that the lobster-like creature depicted p.170 of Grim Tales, is one of the
Dud-a-chum / Dod-a-chock monsters who plague Roland in
The Drawing of the Three.
You could, of course, continue to use it as written if you want more magic;
Well, I am now considering this houserule for a
Stormbringer / Grim tales campaign: Level of spellcasting is equal to the spell-level + the caster's number of
Magical Adept talents. However, this is only when in a place predominently under the rule of Chaos. In places where Law rules stronger, magic becomes much more difficult to cast. In terms of game mechanics, it "locally / temporarily reduces" the number of
Magical Adept talents a caster may have. As such, if a character has 3
Magical Adept talents, in a region where magic is at -2, he will operate as if he had only 1
Magical Adept talent. In a region where magic is at -3, he will operate as if he had no
Magical Adept talent, so here spells burn again his Constitution. This could even lead to spell no functioning any more at all (as should be obviously the case in planes only ruled by Law).