As the subject line reads, Artificial Life 1.4 is now available in the iTunes store! This update is mainly "cosmetic" - no significant changes were made to the behavior of the life forms. However, the app grew in size by about 16 meg! I've added sound effects and 16 minutes of ambient music. Sound effects and music can be toggled on of off per user preference, so if you prefer silent protozoa, that's your choice.
Special thanks to R. Scott Lachance for granting me a license to use his ambient down tempo jazz tracks in the app! The app only includes excerpts of his music that best fit within the context of the app - full length individual tracks from his CD are not present. Check out his music on iTunes if you like what you hear in the the app. It's listed under the artist name DigiTube.
The next update (1.5) is currently under development and will include some other feature suggestions I've received as feedback. Thanks for sending in your ideas!