Scattered Evil as distributed is set to Full HD (1920x1080), you can modify these values before startup in config.cfg (it's in the subfolder "koraxrpg").
Regarding difficulty: if the dungeons in the forest are now too easy, that's actually a good thing from my point of view. Starting way too high on difficulty can turn new players off quickly, especially is they rolled a character that is critically low on some important stat (you can e.g. roll a fighter that can't berserk until level 3, or a cleric that needs 20 hits with his mace to kill an ettin). The idea is to ratchet difficulty up slowly, until on the second last map you have to kill 16-24 ettin warlords (those with Quietus) in one room (this will become a lot more difficult with upcoming improvements to monster AI and the planned introduction of friendly fire recognition).
One thing that seems to be unclear, our concept was from the beginning to have a game that you can play as an FPS or an RPG or a mixture of both at your choice:
Exploring every nook and cranny before taking on difficult assignments (i.e. the RPG way) would make you several times stronger and thus able to beat hard fights simply by an overwhelming amount of quartz flasks and urn on top of overblown HP. As an example, a very cautious playstyle in the RPG vein might make you wanna visit all towns first and talk to all NPCs and fill out your journal before seeking combat. In this case, without even noticing it, you'd receive an extra 30 CON, 8 STR, 8 DEX, 10 INT and 10 WIS. That would mean that the first time you walk into combat, you kill those ettins with a shot/hit or two, and after killing a few you level up, increasing your HP by 30-40 points.
The other way is the extreme FPS way, you can theoretically just check your journal, look up the main quest, go to Daedalon's tower and pick up his first quest, then travel straight to the desert ruins to find that tablet. If you are a fairly good player, you should be able to make it all the way to the tablet, transcribe it and proceed to the exit - which is blocked by a double-team of an Exarch (Heresiarch on steroids) and a Dark Advisor (think Bishop with D'Sparil genes), both of which can summon further bishops (and even Dark Advisor clones), both can turn invulnerable/reflecting for much of the time, and then as garnish there are also a few Centaur Ghost-Kings and Ettin Commanders around. I would love to see a recording of someone beating that room with only weapons nr.1 and 2 at level 5 or so.

This is why most dungeons give you a way back to the world at any given time, so if you feel a place is too difficult, you don't have to reload a savegame from much earlier.