Hi Amaleakim! Thank you for playing OFAF and for leaving your heartfelt review! You have a keen eye and empathise with the characters so much, being able to understand their POVs and underlying essence. And yes! As you pointed out, each of the routes bring different sides of Alto!
*spoiler warning ahead*
As you mentioned, with Kisha, Alto is more reserved as they just met, but she reciprocated the kindness and comfort Kisha gave her with her own unconditional love. Kisha's route focussed more on peeling the "layers" of Alto's true character, until she eventually let her guard down and discovered a side of her she did not even know herself.
In Sol's route, since the two have known each other for a long time, Alto's layers have been removed completely from the get-go, showing her in all her true, unrestrained nature. Perhaps that's why you enjoyed Sol's route more, hehe, we tried to show players a different side of her and added more comedic shenanigans between the two.
Since Lithiel is a mixed bag of personalities, ranging from being incredibly wise to being surprisingly child-like, his route pushed Alto to feel a spectrum of emotions: She went from being scared of him, to angry, to wary, to curious, to playful, and finally, to respect. Also, writing Lithiel's route was very fun as we added more lore dumps and didn't have to care about spoiling the secrets in Kisha and Sol's routes XD. Meanwhile, writing the other routes required loads of meticulousness and cross-checking to keep the suspense and avoid spoilers.
Anyway, thanks once again for sharing your experience and thoughts on OFAF! Hope you enjoyed playing it as much as we enjoyed making it ^^