Lol, there are many Polka-ish parts, kinda Cello-Polka :D (I missed the Tuba's umm-paa-umm-paa, but nevermind)
What I hear is many unison parts, dont hear many divisi ones, and some parts in the cello's melody is too forced in my opinion (especially in the end). Agreed with the overwhelming percussion, focus on balance. I have to setup sibelius again to say more. But besides these, you have good ideas, but I think you have to work on this one more.