This might seem like a bizarre question but, whilst considering whether to put some suggestions on to mantis the problem that they would all be very art intensive crossed my mind, and art takes time and time is limited, but further than that they all expand an area of the game that there is no guarantee others want expanding, so without wanting to seem pretentious...
What keeps you playing AVWW? or rather what would you prefer the devs spent their time on?
Personally whilst I do enjoy the combat, I would much prefer, over and above but not to the exclusion of adding new spells and enemies, that the devs spent their time on making the world itself more interesting to explore, to compare with a couple of other games...
Minecraft: actually adventuring in Minecraft is a surprisingly good example of what i mean, construction aside some of my favourite memories of Minecraft are of interesting geography, of stumbling across chasms that lead to the bottom of the world, of exploring a cave to discover it contained a vast ruined mine.
Knytt\Knytt Stories: For those who haven't played it, it's a 2D platformer which is almost solely about exploration, "combat" as it exists is about avoiding hazards rather than anything else, but the real meat of the game is simply experiencing the world you are in, all that the various powers you acquire do is allow you to explore more freely, to find the cities on the mountain or the ghosts underground, actually finding these things gains you nothing except the joy of discovery. If you can't tell I really like these games.
To compare with AVWW, we don't even have mountains, I mean to give one of my aforementioned suggestions, I think it would be an entirely memorable moment for players, if whilst exploring a region you randomly find a mountain and upon climbing the mountain instead of it just being the normal regions backgrounds what you actually saw was the fractured world in the distance around you.