Thanks I'm glad you liked it!
We tossed around the idea of having purple platforms early on, but decided against it in the end because of how we wanted the rest of the game to work, that is something we might add in the future if we would keep working on it.
As for the connection to the theme we kinda saw it as the connections between each player and their respective colored platforms, and the fact that you need to use both of them to complete the puzzles as a sort of connection between the two controllable characters.