Fun little demo. Here's the bugs I found:
1. I could transmute Aquara into Aurelia. Exact steps were: eat Loren/Fizzy/Nibbles, sleep, eat Aquara, drop Aquara off upstream, eat Aquara again, try to sleep, try to eat Aurelia (option will not trigger), then release Aquara. What will happen is that Aurelia will be teleported to the pond and Aquara will cease to exist.
2. I could softlock the game with Aquara. Exact steps were: eat Loren, sleep, eat Aquara, speak with Fizzy and try to move to Loren's house.
3. Aquara's hill dialogue permanently breaks sleep. Exact steps were: eat Loren, sleep, eat Aquara, have the Aquara hill dialogue, then attempting to sleep afterwards. Doesn't matter if Aquara is regurgitated or not, beds become unusable.
4. The game intermittently softlocks during text if one alt-tabs out at any time. It seems to happen most often when there's automatically triggered text, such as with Fizzy when moving houses or Aquara after eating her unwillingly.
5. I'm not sure if it's intended, but one can permanently eat Aquara by avoiding the hill dialogue by jumping into the trees near Loren's house from the stairway, then sleeping in Loren's bed through the wall.
6. Aquara's dialogue does not advance under specific circumstances. Exact steps were: eat Loren, sleep, eat Aquara without communicating, regurgitate Aquara in the lower pond without moving enough to trigger the "you're heavy" dialogue. Speaking with her after doing these steps causes her to act like it's her first time interacting with Volkan.
7. The section of rocks adjacent to Fizz's house causes collision sounds every frame and extreme camera shake. The exact location is in the crevice near the highest point.