The Dink Network

I encountered a bug with which I cannot deal with: every time I touch the entrance to the cave leading to the core Dink automatically enters it - even without pressing the up arrow and then, in the place with the duck, I see the animation of Dink crawling inside the cave entrance and there is nothing more I can do next except from force-shutting the game. The duck still walks around, Dink is stucked in the entrance and the game stops responding.