Ever wonder what those esoteric Aquarian messages in the backgrounds say? You could laboriously decode them, or just employ the following harmless hack.
Right click on Aquaria.app, and select "Show Package Contents". Navigate to "Contents/Resources/gfx", and take a look at the files "aquarian.png" and "aquarian_alt.png", which contain sprites of the Aquarian alphabet and their translations into English respectively. Rename "aquarian.png" to something else, make a copy of "aquarian_alt.png", and name the copy "aquarian.png".
Now the Aquarian text in the game will be displayed in the yellow English letters in aquarian_alt.png--not nearly as cool looking but much easier to read (except when the game uses a custom sprite with the letters already painted on. Those won't change). To undo, just replace the modified "aquarian.png" with the original copy.