I'm sorry you encountered a game-breaking bug. While the demo version of Froggy Daycare likely won't get updated before the full release, I want to look into the issue to hopefully prevent it from happening in the future.
Were you able to move at any point? Did this happen in the Browser or Standalone version? Did you try refreshing the page / restarting the game, and did it help? What Browser / OS do you use (depending on which version you played)?