Leaving my review public in the comments, because I truly love this game and hope this encourages someone who was on the fence about buying it to do it, because it's so worth it.
I play worldbuilding games with one of my friends on semi regular basis and, after our session of Exquisite Biome ended (which it did but a couple minutes before I started writing this comment), we both agreed this is one of the best sessions we've had so far. The prompts are the highlight here, every time they inspired something we would have never thought of ourselves and drastically changed not only our entire idea of the creature but the entire ecosystem (ex. a transparent flyer squid-like creature turned out to have captivating eyes, which we then decided bear a resemblence to fruits that are common in the area, which completely transformed them into ambush predators and came up in nearly every scene afterwards). They also almost always lead us to follow up questions, which even further developed the world in interesting ways. The freeform structure of the game never stopped us from these tangential discussions about proprioception, blood color and whatnot, which I really appreciate. It never felt like anything here ever tied us down, we were free to go as wild as we wanted and provided all the tools to do so, which I think is the best approach in this kind of games. The whole thing is also decorated with this stellar artwork (with a really interesting and pretty color palette), which, aside from just being very nice to look at, also serves to inspire many ideas.
Overall, one of my favorite worldbuilding games so far. I will certainly come back to it, not only with my friend to continue further building this ecosystem, but also with other people.