Cellcraft is an educational strategy game based around living cells and organisms. A meteor is headed towards the planet, and your job is to create a organism which can save the Platypus species.

Presented with a bare cell, you're slowly introduced to a variety of organelles and acids which help your cell grow and defend itself. Viruses will attack at intervals, at which point it all gets a bit tower defensey. Most of the science stuff went right over my head, but its very informative and even comes with an encyclopedia from looking up any details. Apparently the team has been trying it out in classrooms and getting a positive response.

It's over on Kongregate.