I think this is a game with a lot of promise, that's held back by ambition perhaps too big for a jam game. It wears its STP inspirations on its sleeve, which I deeply respect, but it lacks the same expanse that is what made the many many combinations of STP so awe-inspiring. The art, especially the sense of design, is beautiful. But perhaps some CGs for some of the standout moments, like painting the stars back into the sky, would go a long way. I think it's a strong introduction, but without more, I find myself lacking investment in our trio. Frankly the moon does seem incredibly selfish, and his actions resulted in the death of his brother's spouse. I'd be upset too! Beyond "I love effeminate twinks" there's... just not a lot of compulsion to side with him.
The voice acting is fine, it works well enough, but I don't know if, for me personally, it adds enough to justify the amount of work it entails, or that it makes the lines where it occasionally doesn't work, all the more jarring. It's one of those things that I believe is really, really hard to pull off at the weird in between place of layperson and professional that a lot of us in the fandom occupy.
As for the folklore itself, I think that's my favorite part. I remember awhile back hearing about Sidapa and Bulan... and then finding out that the whole thing was fabricated, and that being a huge scandal. I know that a lot of Filipino culture was lost due to colonization, so sharing more of it, even reinterpreted, is a really noble choice. I do really hope you see this game through and finish it in its intended form.