Twinis! This is the kind of twist on crosswords that I love! With mirrored seed entries!
This was the right level of difficulty for me. The vowel hint ended up helping but in the wrong way - I had ANDES in the left grid for 1D1D(1D - 6D) Area with many tall peaks - Namesake of an ocean[-----], and then was able to put IDEAS12A(11A - 12A) They may be bold or bright - Caesar's land?[-----] on the right and finish that half, before swapping back to the left and correcting my mistake.
That made me think of two options/alternatives instead of disambiguating the two grids via instructions:
- Make the 5x11 (or n×(2n+1) ...) a Schrodinger, and accept either arrangement
- Make it a 5x5 with two distinct solutions, and let the solvers pick one (this does mean you only solve half the puzzle though, kinda)
Either way, great job!