Aquaria

Walkthroughs
There is a full FAQ for the game up on strategywiki.org (by multiple authors).

There are quite a few useful threads on the Bit-Blot forums:

Bit-Blot forum member Ixis has a Treasure Hunter's FAQ posted on those forums. Details where to find the hidden memories, the health eggs, the pets, and all the treasures. Ixis also has a Boss Guide here.

On the same forums, Karn has an ingredients guide, detailing good places to find each ingredient.

Silverkitty has a post up with all the recipes and their in-game effects.

Grawl is working on a Video Walkthough.

KingAl has a thread on the Bit-Blot forums explaining how to translate the runes.

There is a full walkthrough for the first part of the game by co-creator Derek Yu included with the demo.