Hi Paul,
Impressive! It's a great work, well written, well developped and nicely orchestrated. A lot of good stuff in this piece. It's an enjoyable Halloween tale with humor, such as the bassoon melody at the beginning, mixed with drama. Maybe might of been cool to have one really scary short section with some evil chords. 😈
The mix is quite good, although I agree with Jos about the hall, occasionally we feel cramped in a room while the orchestra is big. If you could fix that while keeping the same clarity that would be ideal. It will also help to not feel the solo instruments too upfront.
Regarding the prgramming, this is a pretty challenging piece, mainly due to the lenth and the several times you have fuller sections, so a bit of harshess is to be expected, especially in the tutti sections such as at 5:20, but you could probably tame some instruments there and adjust the mix balance.
Congratulations! Looking forward to hearing more of your pieces.