You're describing Subnautica. To be fair now thinking, this has a lot of things that are really reminiscent of it. Thanks for playing.
Yes, there is a bit of subnautica, but in a way your game have more of a "I don't know what I'm going to discover" vibe that I like, but maybe was I spoiled a lot about Subnautica before playing it!
That definitely sounds like you have spoiled yourself, personally for me Subnautica did feel very much like "I don't know what I'm going to discover"
