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There may actually be more types of life even on Earth, the study on phytoplankton in Lake Karachay had so good discoveries on that.
Also, the latest research on Enceladus and Europa put a shadow of doubt on the fact that to have life, the planet has to be in what we called "habitable" zone. The heat produced by tectonic movements while orbiting a far bigger neighbour (like in case of Saturnīs moon Enceladus or Jupiterīs Europa) may be already creating an environment friendly to alien microbes.
To assume we are alone in Universe as living creatures is unimaginable for me, considering the evolution and the size even of the reachable one, but I think the forms of life on other planets may differ so much, may not be willing to explore, or are just so different that, being far more developed, are perfectly "happy" living in a symbiose with their own environment and do not need to colonise others.
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