Originally earmarked for 23rd May, the delay is apparently due to the team "pumping so much Goo" in the game - whatever that means. In layman's terms though, it's likely that the game simply needs a bit more time to iron out the details; you know, nuke the bugs, polish up the gameplay, the usual. We're fine with a delay if it means a better game is on the horizon.
Announced during the Nintendo Direct back February, World of Goo 2 is the sequel to the 2008 cult hit World of Goo, released on the Wii and Nintendo Switch, among other platforms. Its gameplay is centred aroung creating unique structures by utilising goo.
Tomorrow Corporation is also known for its work on Little Inferno, Human Resource Machine, and 7 Billion Humans, all of which are available on the Switch.