There are no cheat codes for the game, but there are ways to easily cheat (see the end of the post). In general, though, if you are running into problems in a particular region, you can usually explore in a different direction first, or check merchants for equipment upgrades. Consistent problems may need an adjustment to strategy, stat point distribution or skill use.
Early Starter Tips (NON-Spoiler Version)How is your agility? If it is too low you will be hit more often and miss more of your own attacks. You do need constitution, but to some extent using more potions can make up for low hit points, as long as a strong opponent can not kill you in a couple hits. This has to be balanced with strength for equipment requirements (etc), and intelligence (for a mage).
Within the game itself there are various techniques that are quite effective, many described in the topic
Chasing Josie... (spoilers). These tips should work for any strong opponent, and a quick recap follows.
MeteorStrike can be cast as quickly as you can left click, and has a bit of a stunning effect.
Survivor's Curse can be cast repeatedly on a target to drop their resistances, and combined with any elemental attack.
Blind + Hell Spikes is fairly effective, though Hell Spikes needs to be maxed for best effect. With groups of opponents you can skip the Blind spell.
Deadly Gift and scorpion traps will let you take out any opponent, though scorpion traps are relatively rare at the start of the game.
Any character can use a hit and run tactic with a bow, or Deadly Disks, etc. Burning Wall can be used either to slow down (and damage) a following opponent, or to surround an opponent (or group) to do even more damage.
A warrior can drink a shadow potion, stand next to an opponent and use the spin attack (clicking on the ground somewhere) to do damage but not turn visible. This is almost a cheat, and will make any fight easy (and boring).
The Frost damage bonus on a weapon (random attribute) is quite over-powered, freezing any opponent once you get a hit in (then you just stand there and whack away until you win).
Now the cheats.

For a temporary god mode, a reasonable approximation would be to give yourself a large supply of
restoration potions (or healing potions early in the game) and setup a potion hotkey. As long as an opponent can not kill you in 1 or 2 hits, practically unlimited healing would make you very hard to kill.
To copy an item; quick save the game, then drag an item out of your inventory, but not somewhere there is a red X. Without dropping first, quick load the game, then release the mouse button when it starts to load. This will produce a copy of the item on the ground, with the original still in your inventory.
There is a much easier method for items which can be stacked (gold, potions, etc);
Drag a stack out of (or into) your inventory (or container) and hold down the control key before dropping. This will bring up the split stack pane; type in a negative number and hit enter (the checkmark will be greyed out). This can also be done in the trade window.
Alternately, you can use
DAD's item editor to give large stat stat bonuses to a particular piece of equipment and/or a large damage bonus to a weapon. This editor can also rename items, so you could have a 'god mode ring of the cheater', or something.
iZakaroN's SaveEditor (also on Kiya's site, at the item editor link above, with a description) can be used to redistribute stat or skill points, or be used for permanent cheats.
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