Nice work! What happens if you make the sharp blades even longer? So that they stick up of the water? At first I couldn't see them so I didn't know what was "trappy" about this room. Right now I'd say it looks a little boring, a rectangular room filled with pillars. You're very far along though, it's looking really nice, I just wish there was something more interesting in there though.
Maybe changing the composition could help, you need to have something visually interesting at the end, right now it's nothing really interesting.
I dunno, play around a little bit with more interesting shapes, more interesting details
Challenge yourself even more
You're going in the right direction