The descriptions says that it is currently only playable with an xbox controller.
Viewing post in Drunk & Sailing jam comments
Not to worry! We'll be sure to update the game to support more controls once the jam is completely over. We didn't have time to implement more controls and we don't feel good about updating the game to support more during the rating period.
Keep an eye on our page to make sure you know when we update, we'll be more than happy to have you play our game :)