The art was beautiful, and the voice acting was positively charming!
SPOILERS
The the idea of the deity of festivities and merriment being lonely honestly made the entire story feel so much sadder. Even upon meeting Serpentus, it was obvious that something was bothering him in spite of the happy face he tries to put on outwardly.
He's a very compelling character, though. He seems like a decently important deity, who has been left somewhat... broken by having lost those he loves
(Although I am glad that The Panther isn't gone, per se. Just no longer living among mortals) and Serpy's wish to go live among the stars to be with The Panther was awfully sweet.
I really liked how he decided to bring in a normal worshiper to spend his last night with, too. Even though it's awkward, it's really cute how he does his best to enjoy the evening, and even divulges his plan at the end.
(Although it absolutely broke my heart to be able to reject his desires ;-; I was glad he went through with leaving anyhow. I did love that, depending on which choice we made, we could get two variants of Ending 2 as well!)
Although the ending where he left on good terms with the worshiper was the most satisfying to get.
As an aside, even if I didn't know some of what goes on in this game's universe (and I really don't know a lot, save for what information was given in The Vulture... because I need to play the rest of the games, too xD) the story conveys enough of the overarching plot that this works incredibly well as a standalone game.
Just enough is said about the state of their world that you get a decent idea of what's going on.
You did an excellent job with this visual novel. I'm looking forward to playing the rest of the VNs in the same universe, and I'm excited for the ones that you have planned for the future too!