This was very nice! It's not very clear who made the 3D models in the game (if they are assets or not), but the game world seems to be very big, though possibly lacking some content here and there to make the environment also feel more alive (maybe add some more collectibles to justify the walking of the player in large spaces?).
I'd also suggest to make the colors less "washed out": I don't know if the gloomy/dreamy atmosphere was wat you had in mind for the game, but from the art of the game (which I suppose it's AI generated), colors feel brighter and more saturated, while in the game, saturation is turned down and brightness seem to be high, so I think experimenting with either changing the lightning conditions of the game or adding some post processing layer (though more resource consuming) could make the game retain the same color profile of the screenshots you added for the game; also, maybe fog is causing this whiteness/washed-out effect on colors, so try to lower the starting fog distance threshold.
Overall, good job!