Thanks a lot :D
I completely agree that I did not focus a lot on the 'crystal' vibe. I just wanted to make a cool pipe organ castle theme. That's my bad.
The 'sonar-type sound' you describe indeed does not fit too well. It is actually just the same piano playing a single note. I was originally intending to move towards a different theme, one more marching-band-and-trumpets-like, and those notes would be part of the transition. I ended up not making that, but the sound had stuck with me.