Cool concept. Fun visual and animations. The music also adds it.
Some personal opinions:
I actually had a hard time understanding the movement patterns. I think I would have found it easier you could only move to 1 box at a time. Helps plan each step. I kept clicking without realizing it was more than one step and my character started moving while the box backtracked. Also maybe add a highlighted region to show the box movement so we know which route it is gonna take back