You could easily rename this as "We Had Lots of Ideas: The Game" because that's honestly the best way to describe it. A mashup of numerous ideas, art styles, and gameplay mechanics.
Let's start with the first and most easily noticed one, the look of the game. It's fairly inconsistant. This is compounded by the gameplay, too. At times it's trying to be Terraria where you're gathering resources like wood to make platforms, at others it's trying to be Diablo with a Mana Pool for spells and skills and exploring buildings you come across. There's blocky, almost placebo-esque objects, but they're mixed in with lumpy, mishapen boulders.. slender trees.. and even animated portals.
You start off with four randomly generated and barely customizable characters, and there's a very limited number of character designs to boot. This means when Sykdemo Thargbiscuit dies, there's a very good chance that Archibald Roundabout will take their place and look exactly the same. Except their stats may be slighty different, and depending on how far you were before you died, a lot worse. This also means you may have to go from playing a ranged mage to a melee meathead with little say in the matter.
Unlike, say, Rogue Legacy which does this with a charming upgrade system and consistant, yet progressive stats, A Valley Without Wind just kinda.. well, tosses the player into the wind. Oh, and you'll die a lot, to be sure. If not from actual mobs (which is very likely as you have no clue what you're doing, and the User Interface is clunky and unhelpful), then you're sure to die of boredom as you repeat the same handful of tasks over and over again.
I got the game ages ago as part of a bundle because I thought it'd be a fun Metroidvania sort of title, and at first glance it definitely seemed like it might be. Unfortunately, the other thing AVWW reeks of is the feeling that it's unfinished. It's pretty clear the developers got partway through progress of making the game, given it's bizarre title screen which features "asking for your key", a blurb about the aforementioned progress which hasn't updated in forever, and a scrolling storyline summary which is about as much as I ever got for plot.
Even free it didn't feel worth it. I just hope the bundle came with other games I actually enjoyed, but it was so long ago I have no idea anymore. I can definitely tell you that unless the sequel is made out of ♥♥♥♥♥♥s and maybe chocolate, it probably isn't worth the $15 it's currently sitting at, either.
As an aside, I've read that there is eventually city building. Sadly, the game just couldn't keep my interest long enough to actually make it that far. From what I understand from a friend who has played it, and a few other reviews.. you don't get the sense of progression you ought to in a game like this. Once you "complete" an island with rebuilding, bosses, and so forth, you just go off and repeat it and this happens ad nauseum. Given how the general gameplay was so unpolished, I can't imagine the rebuilding stage of it to be any better.