Eufloria is described as 'ambient game of space exploration and conquest that employs surprising themes of plant growth and bio mechanical evolution'. There are six games similar to Eufloria for a variety of platforms, including iPhone, Windows, iPad, Linux and Online / Web-based. The best alternative is World of Goo. It's not free, so if you're looking for a free alternative, you could try OpenGOO or Moonlights. Other Eufloria like games are Huje Tower (Freemium), Tower of Goo (Free) and Prune (Paid).