Well, I had a lot of trouble understanding the usefulness of the crates. I can't stress this enough: if you use the mouse occasionally in your games, mention it. A simple drawing would have been enough.
Other than that, I appreciated the concept, although limiting the range of the crates would have been necessary.
Well done! It was a pleasure to see what you accomplished in such a short time, quite an achievement.
And thanks for the comments you leave for everyone; that's cool.