My showcase

[Spelos]

It looks good for a base. I understand that you just practice, though I'd suggest practicing Level Design as well.

By Level Design, I of course don't mean the looks of a level (mostly), but rather the design intension and flow of the overall gameplay mechanics.

Having a clear focus of what is and what is not important and developing your own design language is as important as the details of your map. At least I do think so.

In its current state, it looks like a simple Dungeon level with the focus being solely on the key. (which is too Amnesia Custom story, if you know what I mean), I would practice telling a story with your environment.

Other than that, I like your intention and reasoning. Some people just put stuff together without a clear focus. Keep it up and keep us updated.