I can't for the life of me get the final hit on the level 3 snake in the 2nd Halfling puzzle - I must have tried 20+ times.
This puzzle is very finicky, and I'd actually agree that the devs should loosen it up a little.
For example, my Sorcerer cleared the dungeon and then there was a sub-dungeon with a dragon in it, it's immune to physical damage so I threw a fireball at it and died. It took me another 3 or 4 goes to clear that dungeon again, I've learnt to avoid the dragon but have absolutely no idea what it does.
That particular dragon has the ability to reflect fireballs. Very few monsters have this property. Try finding a non-violent way to pass this dragon, there's something very important on the other side.
With some of the glyphs, I've tried using them but couldn't tell what any of the secondary elements of it was doing (I think it's the swap-spots one, seems to have other benefits such as no retaliation but it didn't seem to do that for me).
The WEYTWUT (and WONAFYT) glyphs are a little weird. They slow the monster, which disables many types of special abilities until you next attack the them.
Also, if you manage to kill the monster in a single attack after using this glyph, you gain +1 bonus experience and the monster doesn't get to hit back. If you don't kill them, however, then they get to hit back normally.
Most of the tutorials (other than the starter pack) get kind of ridiculously obtuse - often involving tactics that are distinctly sub-optimal in actual dungeons. I had to look up solutions to quite a few of them, myself.
I'd agree with this sentiment; most of the puzzles seem designed for veterans to test their total mastery of the game, rather than beginners to push them in the direction of common techniques.
(Honestly, I still think Retaliate Fireball, or Counter Fireball as it used to be called, is a fairly silly and needlessly obtuse trait; 95% of the time it's functionally equivalent to magic immunity,
Well, you can still use other spells, such as PISORF, WEYTWUT, or APHEELSIK on such monsters without fear of retaliation, so it's not quite the same as magic immunity. Certainly one of the abilities to watch out for.