This is SUCH a fun concept! I wish that there were more reference images/mood boards so that I could have a better understanding of the visuals that you're intending to incorporate: is this going to be a first person POV or third person POV? I recently played Subnautica for the first time (I know, I know, I'm like a decade late) and if you're planning on taking a similar approach to player perspective, I would totally advise looking into that for ideas. The proposed mechanics seem fun, on topic, and within scope. I can't wait to see more!