There's a fine line between nonchalance and disregard for the player, and I'm not sure that Aquaria doesn't cross over it. As one of the best games on the Shield right now, I've been playing a lot of it — or, rather, alternating between playing it and looking up clues online. In a way, I respect the sheer amount of content the developers have put together, and the confidence they have in players to discover it, but I could use a little more signposting and, to be honest, a bit more challenge.
For example, the middle section of Aquaria is mostly non-linear: certain areas are locked away until you've beaten a few bosses and taken their abilities, but the order is still mostly flexible. Although it sounds great in theory, in practice this just means you're repeatedly lost and without a real goal. Having enormous maps just makes exacerbates the problem, because it means you'll wander one way across the world only to find out that you're not quite ready yet and need to hunt down another boss somewhere — probably all the way at the other end.
I'm goal-oriented in games, so this kind of ambiguity has always bugged me. The Castlevania titles post-Symphony of the Night suffer from this to some extent, but they usually offered something to do during the trip that made it feel productive--levelling up your character, or offering random weapon drops. Aquaria has a limited cooking system, but it's only really necessary in boss fights and it rarely does anything besides offer healing and specific boosts, so it's not very compelling.
According to an interview with the developers, Aquaria was originally controlled with keyboard and mouse, and they eventually moved it to mouse-only (which came in handy when it was ported to touch devices). Every now and then the original design peeks through, like when certain enemies fire projectiles in a bullet-hell shooter pattern. The Shield's twin-stick controls make this really easy (and fun) to dodge, but since the game was intended for touch, these enemies are relatively rare, and the lengthy travel through the game tends toward the monotonous.
Look, I get that we have entered a brave new world of touch-based control schemes. For the most part, I am in favor of that — I'm always happy to see innovation and experimentation. But playing Aquaria on the Shield makes it clear that there's a lot of tension between physical and touch controls, and it's easy to lose something in the transition from the former to the latter. Aquaria designed around a gamepad (and an un-obstructed screen) could be a much more interesting game. Yes, it would be harder and less accessible — but the existing game leaves us with "easy and tedious," which is arguably a worse crime.
I'm starting to think that in our rush to embrace casual, touch experiences (in no small part because of the rise of touch-only devices), we may be making assumptions about the audience that aren't true — such as the idea that it's the buttons themselves that were scary — and it's not always a net positive for game design. At its heart, Aquaria is a "core" game, not a casual game: it's just too big, and the bosses are too rough, for this to be in the same genre as Angry Birds or whatever. Compare this to Cave Story (its obvious inspiration), a game that was free to cram a ridiculous amount of non-linear content into its setting because its traditional platforming gameploy was so solid.
There is a disturbing tendency for many people to insist that there must be a winner and a loser in any choice. In the last two weeks, every tech site on the planet decided that the loser was Nintendo: why don't they just close up shop and make iPhone games? I think it's a silly idea — anyone measuring Nintendo's success now against their performance with the Wii is grading them on the wrong end of a ridiculous curve — and Aquaria only makes me feel stronger about that. For all that smartphone gaming brings us, there are some experiences that are just going to be better with buttons and real gaming hardware. As long as that's the case, consoles are in no danger of extinction.