@domenixius Thank you! Yes, the invisible wall to the south is intended, though I’m not sure why I didn't make it look like the other walls. The main challenge was that the orthographic camera was clipping through the geometry, so I created a "buffer zone" with small walls to prevent the player - and consequently the camera - from getting too close to the tall walls.
There is no visual wall to the south, so the invisible one is there to prevent the player from seeing that there’s nothing beyond it. I realize now I could have easily fixed that; I must have just missed it in the rush.
I’m also sorry to disappoint you regarding the music. I'm not much of a composer, but I definitely would have tried to write something original if I’d had more time. I was actually worried the game wouldn't have any sound at all! The audio was a last-hour addition. I managed to create all the SFX in an hour, but for me, a full track requires much more than that.