My indie game, Immortal Defense, which is a story-based tower defense game, is on sale for whatever price you want to pay through PayPal (normal price $15), through January 1:
http://studioeres.com/games/content/immortal-defense-pay-what-you-want-saleThe idea of 'pay whatever you want' was taken from World of Goo, which had a similar sale a few months ago.
I figured some of those who liked Aquaria might also like this game, since both are story-based. Trivia: Derek (of Aquaria fame) liked the game but didn't like the portrait art, so he actually helped us redraw some of the portraits for the game awhile back, although I haven't yet made an update to the game which includes his portrait improvements (although I plan to eventually!).
The game is Windows only currently, unfortunately.
Shine,