I solved every main line puzzle without spoilers at all. The puzzles aren't overly difficult, and the clues are mostly good enough to help, even if they're sometimes cryptic, which is GOOD. It would be boring if everything was extremely easy.
I hope that the devs don't run around trying to appease every person that has a problem and wishes things would be easier/changed/modified. I think you guys did an excellent job on both the engine and the game itself, and it all works perfectly as intended.
Legend of Grimrock is the best CRPG I've played in a very long time. Dumbing it down would be a huge shame; it's great to have developers that will release a tough niche game like this that we've been missing for so long.