Dan,

An excellent piece.

The piano is really pretty. The orchestration is well done. I did not find the change as "jarring" as expected (from Tangmo's comment), but it was "sudden" (which might be your intent). If you want to "soften" it a bit, you could add two short stabs leading into it to "get the ear ready" (or not). After the initial start, the "surprise" fades quickly.

I really enjoyed the listen. Well done!

fj