If it is really your first 3D, then you probably learned a few new things, which is always good.
The game itself has no real objective. I went through the door and that's it. Game ends. Do I miss something there?
But here some constructive criticism:
- For better lighting add Post-Processing and use Bloom and other of it's features.
- The texts on the wall seems to be created with Microsoft's Paint. You can use Google Fonts (but look for correct using license) and TextMeshPro to gain a higher quality of text.
- I had to get to the objects really close to actually use them. A bit higher range would be nice, so that my face has not to touch it.
- If the game was intended to be some kind of Escape Room then a bit more riddles would be nice.
All in all it's a solid build, but lacks of interesting interactions/objectives.