Hi, thanks for commenting, this Jam has inspired me to get on with some game Development.
I will be developing this further and have so since the Jam.
The idea is that player (the nannite block) wanders around and "connects" with the other nannite blocks increasingly getting bigger.
Once you reach a certain size you will transform into a larger nanite.
At the same time there will be evil nanites who are doing the same.