Just Me?

My character for my game will randomly move by its self. Mostly its just a little movement, but makes it difficult to move in the opposite direction. This often occurs when additional force it applied to my sprite and can only be stopped if I run into a wall. It appears 99% of the time in the tutorial of my game especially when moving the box or when the box gets hit by the Pac-Man.

http://www.flowlab.io/game/play/210582

P.S. Do I have to do something special since I’m using Pac-Man (for copyright purposes?)

Something like that happened to me too in my game. I walked one direction and it stuck until I refreshed the page.

I couldn’t get it to stick, but wow - the first level is hard!