This is very kind of you for taking your time to write a detailed feedback including even on what I can do to help address it - this is as valuable as treasure in my book, thank you very much! :)
I wanted to depict currents not just at the edges so I put in those moving pixels, I was trying to aim for something like what minecraft does where it's balanced between being subtle and noticeable. For the overhang, I was trying to depict those as the crevices where the water would come seeping through from the deposits they came from but if you're interpreting it as overhangs, that means that I haven't been able to communicate that well. Thank you for your insights on this, I'll definitely take a second look on them.
I should've been more thoughtful on this other point of yours, but you're absolutely correct. I'll consider whether to completely finish this biome first or move on temporarily with the other layers I had in mind for this asset pack before going back. It's going to be less easy, but I think it'll help address the issue more firmly - I just hope that people wouldn't think I've abandoned the project. But I'll do this only after I've addressed the earlier point you had and the animations for Stub.
He's the rock mimic actually ^^, I'm currently working on completing his animation set although now that you've mentioned it, I've only planned one attack for him as of writing, I planned to compensate for that with him being able to be implemented in other gameplay aspects which is why I'm taking my time animating the guy.
But really, thank you for your guidance! I didn't really expect for it to blow up or anything, but I was absolutely taken by surprise that there wasn't anything, even a complaint or feedback like this one, so it felt like I was sharing something I was excited about with nobody, so that's on me. But you're right, the only thing I can do is keep working on adding more stuff to it. All the best on your self-endeavors!