The game didn't crash actually - for some reason (I have no idea why) if you press the Start/Restart button from below the game thinks that you pressed the Exit button. You even can see for a few frames before closing that the game for some reason chooses the Exit button as pressed.
And about the second level: I actually have no idea why it is happening with an axe. You're not the first one who faced the issue but I just cannot repro it to understand what's wrong.