There's quite a bit going on behind the scenes, but nothing related to the things you've mentioned. It's fairly basic but seems to be reliable and predictable game-play wise (which was no small feat, because modding in water presents a lot of unique challenges). The fish traps all have their own unique and random behaviors and considerations, fish can die and rot right in traps (if they don't escape first) and bait can rot too (if it's not stolen first), different fish offer up different amounts of nourishment, and they're pretty tough to process (cook) and manage (inventory wise) since there's many types. Honestly, I made it relatively easy to catch fish because that's only a part of the process. I'm kind of enjoying playing it, but I'm a little biased.
I snared my first rabbit not too long ago so there's that too.
If you haven't taken it for a spin yet you might hold off until the next release (maybe in a couple of weeks). I've got some basic animation working now for the fishes, which, along with the particles (bubbles) has made things a little more lively.