Thank for letting me! Originally the message only showed up after 6 routes were played but most people seem to play just a few so I figured having the message show up sooner would be better to obtain the bonus gallery images. I'll take this into account for a future update!
oh, you're welcome, thank you for responding! I can definitely see the logic there. If I may make a suggestion, (though I'm not currently a developer and so I don't know how hard this could be to implement, so take it with a grain of salt) but maybe instead of one developer message where you choose one character to learn about, at the end of every route there could be a message specifically about the development of their route? It would definitely be a good idea to still have the gallery images unlockable before all of the routes have been completed though.