This is surprisingly hard, melee opponents seem very deadly and it's not that easy to hit with the sword. Weird that strafing is slower than running forward / backward. Of course the rogue like nature would explain some of the difficulty, though the game immediately throw a wide variety of enemies at you, while others games would start with 2-3 and after each few levels introduce a new one.
The new version is much easier, mostly due to the sword being much better. It seemed that before your success depended a lot on if you could find more guns and enough ammo to not run out, but now it's much easier to use the sword and conserve ammo. I didn't find how to save, so that still made it reasonably challenging, especially with the deadly pits. Weakest point now would be the AI and how easy it is to abuse their detection area and pick them one by one. Overall not bad considering it's free.