We're glad to hear that you enjoyed the game!
As for Mira's name we just thought it Cosgrove was pretty and had the requisite C to make Mira's initals MC (We've been theme naming the initial Main Characters as a reference to them being the MC lol).
We didn't make the connection to the actress ^^'. By the time it was brought to our attention it was already too late to change it.
So yeah, there's no inside joke. She just happens to have the same name.