Vertebreaker was a 16-bit style title in the works for Switch, coming from Sonic Mania developer Headcannon. The game was planned for Switch, but would only see release if the Kickstarter hit a $330k stretch goal, with the base sitting at $275k. After just one week of the Kickstarter, the crowdfunding efforts have been cancelled. Headcannon developer Stealth said that the crowdfunding brought in just 5% of the total goal, calling it a 'spectacular failure.'
In the video above, Stealth goes on to say that despite public opinion, he's not a wealthy man after Sonic Mania's success. Stealth does not see royalties from the game's continued sales. Many found the base goal for Vertebreaker to be far too high, and thought Stealth to be greedy, which is most likely why he shared the Sonic Mania sales tidbit.
While the story above is a sad one, Vertebreaker still has a chance at launching. Headcannon is going to completely rework things for their crowdfunding efforts, and will return with a new campaign in the future.