Funny intro. Quite a neat concept. I was initially confused because it looked like the ladders were already there when they were just guides to show where I should place the ladders. Once I figured it out I thought it was neat though. Also the animation for climbing the ladder was neat, very smooth.
Also, it was good how you had the character continuously moving until the box was removed. It gave the right impression that he would just auto-walk without needing to explain that it words. The game felt a bit like anti-Lemmings, if you've played that old game.