During my time with it:

The first part of the tutorial (where you're supposed to fly into four boxes) kept warping me back to start if I ever, once, let off the accelerator. What the heck.

The first mission where you get out of your ship has your camera shaking violently as you're trying to swim through the tiny hole. Also, finding the hole? Rough for me.

Did you know you're supposed to press the F key to use stuff? Or to land in your base? Because the tutorial never actually says that. I spent five minutes trying to be clever and actually land on the platform.

Oh, and playing keyboard + mouse is fluid, but there's a bunch of buttons labeled RB and LB.

There's a lot that's neat here, but the jank is real, and the flavor of the game as of right now isn't overcoming said jank. For $15 (11% off as of the time of this writing at $13.34), I will give it a teensy bit more time to see how the upcoming patches fix some of this, but I couldn't recommend it to people at this time.

After spending time with Stardiver, I can say it’s a stunning underwater exploration game. The visuals and soundtrack create a really calming vibe, perfect for relaxed exploration. I found no issues with managing settings and autosaves. Game didn't crash a single time.

Graphics are very nice & crisp, so no negative comments there. Audio & soundtrack very good.

Optimization is not very good, even at low settings i get maximum 45 fps and i have a reasonable system that is above the recommended specs ( AMD 5800X3D & Nvidia 3080TI & 32GB Ram ). Every other game i can run easily on ultra settings and get 120fps. So the optimization needs a lot of work.

The controls are good and the ship responds very good, only criticism i have is that it is a little confusing to have the double "cursor" , i mean you have the mouse cursor and the crosshair and it would be nice to have an option to hide the mouse cursor.

One more point is the map and the visibility of objectives. On the minimap you get directions where you need to go and the icons are very clear, no negatives there, but when you arive on the spot it is not very clear where you need to go and the scanner does nothing for the directions. In the very early missions you need to look for mining tools in a cave. When you arrive there several enemies attack and after defeating them the AI tells you to go inside the cave to check what they were protecting. I have been looking on this spot, but never could find the entrance to the cave and i just quit playing.

So please give some waypoint or something to make the objectives more visible.

As for recommending the game, i wish steam had a neutral recommendation, but at this time with the optimization problems and quest directions i cannot recommend this game.

I am not going to refund, but i will wait with playing for now until there are some patches which fix these problems.
Sorry dev for the negatives and i will change my recommendation when the problems are fixed ( i hope for the best ).