Kind of delayed, but I actually got deep into this finally (generally prefer to wait for a game to get a decent amount of content before I play.)
Wow, you did a really great job making all of the characters varied. Species-wise you did use fox twice, but Zoe's character elevates the mind away from that. Generally I would like to see more species-quirks come up naturally in the writing, but you did a decent amount so far, and there is a fine line where it becomes overbearing.
Gameplay-wise (Character Focused) I think certain "Like" generating actions should start giving Love as well after you pass certain events/breakpoints, as it's kind of a game-story disconnect with the characters. Stupid idea, but it came into my head that if you gave a gift that a character hated when they were at max like/love, you'd get a one-off scene where they say what amounts to "well I hate it, but I love you, so I'll let it slide this one time". I also thought Grace "hating" the dress was a little funny given what the player learns about her later. Again though, it's just a disconnect. Ideally it would be something that switches after the player passes a certain milestone.
The actual bar management is a bit light on the management side of things, but I actually appreciated that since I was worried it would be very prone to fail states, which is thankfully not the case. It DOES make me wonder if there's some future plan to have something happen further in that requires the player to buckle down to keep the bar afloat. Probably not, but it'd hit home with future content maybe?
I'm biased, but a shortstack species would definitely be cool if clipping issues didn't make that non-feasible, that or a much taller girl, like a giraffe.