Hello everyone,
I just released a minor update to address the not so obvious coop mode.
The 2nd button of the menu will show (now) if you are presently in SOLO or COOP mode.
To change your playing preference from solo to coop mode, simply reach the option screen and select the number of nanobots to be injected in your play session.
Then simply return to the main menu and witness the "nano-fantastic" clarity.
Thank you for playing NA.NO game :)