Gameplay: 4/5 - Classic, but the driving of the cubes along the path is a nice add. On the other hand I felt too submissive to the luck of initial setup, and I regret I only have to search for very short-term solutions.
Visuals: 3/5 - Simple but colorful. Lack a few useful indications (selected cube, clearer indication of free/occupied slots)
Audio: 4/5 - Nice, but only a few effects
Enjoy the game : 4/5 - I spent pleasant minutes. I liked the surprise of having to drive the cubes.
Theme : 2/5 - 2 points because you wrote the theme in the title ;)