Yeah, you are right about the timer. I just needed to add some kind of game ending. There is an explosion animation and after that the Deep Blue is gone. Since picking timer is a precondition to reach the end I added 10s timeout to show the timer was useful for something.. Could be better but I was running out of time and this ending is probably better than no ending.
About enemies - I was actually thinking about add some pawn guards which won't let the pawn pass. And our pawn could jump diagonally over one of them as in chess. It could bring more different puzzle situations.
Thank you for feedback!