As others have said before, this is a puzzle we would play as kids! I like how you expanded on it, which was tons of fun.
Sadly, the instructions on the fourth level were unclear. At first I thought I was just supposed to have them swap sides, but when I had done that and found it didn't work, I had to restart.
The chosen font and the design of the menu is not very pleasing to look at. But the game is functional, so I'd say you did well!