It looks like that may soon change. We've known since it was released that developer Mojang has always planned to bring upgrades to Pocket Edition to add Survival Mode, which is where the actual game part of Minecraft lives. Today, Daniel Kaplan, a designer working on the game, put out an update letting us know how things are going on that front. It seems that the team is tentatively scheduling an update to be released February 8th, which will "support the survival aspects of the game". So, this will get the game ready for Survival Mode, but won't be adding it just yet.
We just hope the full Survival Mode isn't too far behind.