Besides, when it comes to difficulty Saira can't come anywhere close to e.g. Mega Man 9 which I specifically enjoyed for it's insane difficulty. They didn't offer an easy mode yet the game seems to do well.
Mega man 9 - what a wonder! I haven't beat it yet, but it is a really fresh breath in this age of games moving closer and closer to hollywood scripts, and as you mentioned, eternal hand-holding.
Other great examples of games that are incredibly hard but very well rewarding are Myst and Riven. I still haven't beaten those two, but i've beaten all their sequels which tells something about how the general game design ideology have changed over time. I think this is harmful in many cases. In the end, you get hordes of players that are accustomed to games who, in my opinion, lacks quality simply because they doesn't
engage, nor reward. If there's anything i prioritize in a game, it is the following four conditions:
-Game is engaging (you don't sit and passively observe, like it was some movie)
-Game is rewarding (you feel you've really accomplished something, combined with that you feel like earn something (new scenes, moods, atmosphere, music, story progression and/or items)
-Game has a high replay value (through for example variable ends, secrets, unlockable modes, characters etc, item collection/trading, achievement earning etc)
-A degree of uniqueness (be it gameplay, outstanding graphical design, rare online solutions, rare concept or goal)
If there's any of these i think Saira might lack, it would be the replayability. While it feels nice to revisit the beautiful environments, there seems to be no secrets to be found. But this only counts for now. Eventually, there might come new fanmade episodes, perhaps (oh, i wish!) even official expansions from what i've read.
DWaF was absolutely trickier than Saira, yes. I, however, found much more resemblance from Knytt/Knytt stories, despite some fundamental differences (in both DWaf and Saira, if you've finished a cave/planet, you won't be going there much more while you run through and backtrack constantly in many KS levels as soon as a new object is acquired). Also, players who are a fan of the atmosphere of Knytt should get an overdose in Saira (in a most pleasant way).