Just played through it - good fun, puzzles a bit more involved, loved the easter eggs - especially when using different frequencies on the wall.
Only possible bug, I seemed to collect one of the zinc bars when on the concrete near the door instead of on the field.
I'm glad you enjoyed it and that you took the time to look through the different walls :D I wanted to do more there, but kind of ran out of time. The zinc bars being out of bounds is baffling. I need to re-examine that part. I've seen it happen a lot.
I'm happy you played it and enjoyed it, though! Thanks for the feedback <3