So, I played the game I like the concept, but I think I would have preferred to have a small tutorial for at least the first level. Some kind of video tutorial or hint would have been great.
I think the controls for the arrow moves should be explained as these are the main mechanic to finish the puzzle. I didn't figure out I could change or move the arrow until level 2. It would be much easier and fun to jump in knowing how the game works rather than guessing what the controls are. What I would suggest is putting these in the settings menu or doing a mini video tutorial before the menu begins.
The music is a little monotonous and sometimes did not fit very well with the game. What I would suggest is maybe making something more cognitive but still "tron-like". That might fit better. Also, there should be some sound effects for the ball shooting and destroying.
Hope this helps.