A simple game in 2D or in a simple 3D projection for PC.

A simple game in 2D or in a simple 3D projection for PC. The game involves a fixed number of icons running around the computer screen in a predefined random order. The game should ask the user how many icons can exist at a given time and adjust their positions at various locations within the screen. The game should also be able to play custom voice or music every now and then. Definitely requires a lot of randomness in the movement of the icons. The code or design file should be made available, along with the instructions on how to modify basic items. Preferably using Unity but other platforms are also ok.