That was certainly weird. Pretty interesting in its weirdness, too. It had some coherence and wasn't just randomness. I would have preferred the characters to be spazzing out less when they aren't on the hallucinogen. Just gets a bit repetitive. Some of the effects and backgrounds legitimately looked very cool, like the character transformations, for instance, that of Hubert at the start when he shrivels up and the kids disintegrating at the end.
The actual story itself is quite interesting, but I think it could be a bit less nonsensical in the sense that it just seems like everyone's going to random places and random things are happening, and I don't think it was explained well what the zombie thing was all about, though I think it was an issue of wording in the subtitles. I read it as people losing the ability to hallucinate and losing the ability to become zombies. Still, reading the description, there's way too much weird stuff that you seem to have worked out in your head but that just isn't shown here. Why did they go to the temple? The horse was the father's spirit form??? People weren't turning into zombies because of the hallucinogen but in spite of it?
I'm all for surrealism and surreal stories, but I just think you went overboard with the randomness and weirdness because it can be very hard to tell what's supposed to be happening when stuff is this weird. There were parts of it done right, some really quite atmospheric and impressive-looking things and pretty fun surreal character designs.