Okay, let's begin.
Bug: Sometimes at the end of a route, the title screen freezes and you have to reload the page.
*Everything seems to work normally. I don't know if the ending has anything strange going on because I can't see the code. I suspect it's the typical +1 or -1 option, and in the end, they choose based on a range, which I'm not sure is the best, but that would depend on your writing skills and judgment.
Puzzles: The slippers are strange because (although I admit that I interacted with them in my first run, but only because i always look everything in the room) you can open the door to the other room without seeing them, and if you see them later, the same dialogue appears. I like the concept of "time is frezze" and lighting the candles.
Story: I can't talk about that; I didn't understand it, and I'm not familiar with the historical context mentioned in the description. Stories inspired by a culture don't need to include unnecessary context for those unfamiliar with it, but if another language is added to reach a wider audience, I think they should at least include some background information for that audience.
*There are some odd things about how the routes work. I wouldn't call them errors or not, because my mind is very imaginative when it comes to filling/ignoring plot holes, but I will say they feel strange, and coming from me, that's not good. Sometimes I feel like the last option has all the control, and Lian always responding the same way reinforces that. In my experience, the only thing that disproves this is that you can get the bad ending by always choosing the third option and then "stay with you" as the last choice. I don't know how most people understood it, but it took me a while to figure out how to get the good ending. Once I got it, I tried again to eliminate options, and I think the key is to always choose the first option, but say "I know why"(second) that one time. You can also say "we're never be there"(second) and it works the same.
I had a nice mental image of the endings descriptions, seria bonito que hubiera alguna. Aside from that, I'm now curious about the context. The wiki you linked doesn't have a Spanish translation, so I felt like contributing by translating it myself. And hey, if you need I can translate English-Spanish; I don't speak Indonesian, sorry.