Roger, I'll do me best :3. In the forum I'm at (Forum64.de) most players so far are loving the engine. Feedback all in all was mostly about the first map being too challenging (in terms of secrets) where people sort of thought it would ease them in, like a tutorial. I'm completely in that space where I'm aware of all the little thing from Wolfenstein 3D and they mostly don't, so I guess that's why. But they enjoyed finding these secrets and noted that they liked how subtle hints were hidden, like the walls being a tiny bit "different" to suggest trying to push them open. One said they think sound could be better, although it was good enough. In the end, people had mixed opinions on the starter map, and praised the engine very very much. :3 And a few of them also enjoy the mouse controls. So that's definitely getting used!
And yeah, with all those varying opinions on map design, that's the thing: just like back then, there were maps that had a focus on action, on exploration, puzzles and secrets, or combinations of these, and not everyone likes every map the same, that's just how it is. From your earlier demos, I recognised the Shareware Wolf3D map, even visually just by seeing the rooms (and later in the editor). That's all to be expected. My old DOOM map was super convoluted (not like a labyrinth). Most people wanted action so they didn't like that, but enough people did, and I kept making them like that.
I wonder if it could be possible to move the cursor in the map editor with the mouse as well. The little block. Keep everything else as-is.