Co-op play wasn't supported when Volcanoids went live last year, but as of yesterday, it's there.
"The most requested feature of all" was finally rolled out in an update that went live yesterday. "From now on you will be able to crew up with up to 3 other friends to commandeer drillships, scavenge, build, fight and survive together!" developer Volcanoid said.
To celebrate the release of the big update, Volcanoids is on sale for 25 percent off until May 27, dropping it to $15/£12/€13. The full update notes are below.