Fancy meeting you here lolThere is enough to unlock the gallery, you might have missed a few. From what I've counted there are 38 coins in the game and 37 girls (plus you get Fenrir for free) so you only really only need to collect 36/38 of the coins. I'll look into it again for v0.5 to see if some gallery coins are being deleted upon playtime or aren't showing up. 100% Gallery save file is available on my Patreon.