The name is very fitting!! Your piece has a playfulness to it that is refreshing and fun. It's easy to listen to. I wonder what would happen if you gave the tuba the melody at times and used the other instruments to harmonize above it, could be especially nice with the Flute, Clarinet, and Oboe. I will also echo what @maestrowick said - the tuba can do so much more! Use it's different registers and play with the rhythm some more. Tuba, Bass clarinet, Bassoon etc are used to the one note, barely moving bass lines in pieces, but you have a chance to let the tuba shine, so let it shine. Please update us if you make any edits to the piece - good work