I also just ended up spamming walls and switching between dimensions as fast as possible. It was a little rough working around the colliders of the "invisible" enemies and sometimes my walls didn't seem to be placed exactly right. I think there's a lot of potential, though and I really enjoyed playing it! (definitely felt nice and accomplished when I saw that timer run out :p)

I liked the idea of constantly having to balance between the two dimensions.

I did find the controls a bit difficult though. Ended up spamming walls hoping I’d place them in the right place.