I like the idea of giving players tips along the way, since personally I tend to think that difficulty in the game comes from understanding the mechanics and using what you find, also not being put off by the loud mouthed people with no patience (you should've seen what happened with a dark room and the Ensign).
for resurrection, I a resurrection item sounds good since there have been times (like the last game I got to the castle), where it would've been really handy to have in reserve, though I do see the point of making sure players can't hold more items.
In terms of extending the game, I actually like the length the game has at the moment, what would be cool would be more encounters, traps, monsters, different locations to visit and extending some of the mechanics a little to throw even more fun into the mix.
For example:
Towers of testing: Ruins and dungeons are cool, but a successive tower with a harder challenge on each floor would be fun, and be a nice way to test your greed vs, survival instincts.
Blessings: It'd be fun to have temples to gods where you could earn a blessing which changed the game in some way giving you benefits so long as you adhered to the god's own wishes. For example, perhaps you could have a defense plus 4 blessing, but to retain it you'd have to use no edged weapons, or have a life plus 2 blessing, but be required to abstain from mushrooms.
Ranged weapons, usable just before a fight starts to hit a monster, but with the disadvantage that after using a ranged weapon the enemy always gets the first round of attack, plus of course once you've used your arrow or thrown your dagger its gone.
Combat conditions: What I mean here are random affects that sometimes happen during fights to make things even more interesting such as you and the monster losing speed due to muddy ground conditions, or both getting a higher defence due to a narrow passage, you could make life particularly interesting by varying these in environment.
Poisoned mushrooms: At the moment none identified mushrooms really aren't too bad, but it makes sense there are some nasty ones out there.
Cursed weapons: what is a roguelike without cursed weapons? Actually cursed weapons would be even more fun here, since with weapon breakage as a thing, it'd be quite an amusing game change to be wailing away with that cursed minus 2 attack sword in hopes of it breaking .
Potion brewing: I always end up finding more mushrooms than I need, it'd be sort of cool to be able to brew potions out of these, perhaps to make them safer to drink or perhaps with the threat of them blowing up in your face.
Previous character's body: It'd be rather fun (as well as potentially an ease to difficulty), if after your character died, your next run you could encounter the previous character's body containing one or other of their items. Obviously not their hole inventory (all those grave robbing goblins), but maybe just a single item chosen at random from the pool of any items your current character didn't have.
And before I go totally off the rails with suggestions methinks I'll stop there .
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)