Heya, I see you used UE4 so I wanted to mention some things to you, especially concerning your level design:
In the overall it`s okay for an indie game, especially when you see that you are no studio but still you can put some small effort into it by adding post process, planar reflection and some LUTs on it.
Also you could touch the colour grading a bit and turn it into something more negative or positive, depends on what kind of atmosphere you want but you need to admit the shading was quite not there so really give ambient occlusion and bloom a try.
Here`s a vid on how you could adjust all these settings and I hope to see your game improve over time!