Hello again, Luis!
Glad you now know a thing about sea shanties! I never thought about making a "manly" song, but then again this was based on Twinkle, Twinkle, Little Star. I often believe you need a men's choir for that mature tone, but this doesn't have it. Nice point, though.
There's something funny in the video-roll... But I prefer an actual score.
The fugue sounds fine to me, interesting, beautiful. Perhaps the fact of writing for two voices (for keyboard) allows you to put disntance between the voices sometimes. When you write for 3 or 4 voices for piano or similar, it's different.
I didn't know the meaning of "sea shanty", now I know it... Interesting the drone-like bass (cello?), or in counterpoint. The tune is quite catchy. But it sounds between that kind of song and a song for children. Work songs sound more manly, take a look at the tunes from Der Fliegende Holländer (Wagner)...
This is one of rare examples in Slovenian literature for euphonium. It is neoclassical concerto with all neccessary features: sonata form, easy-to-follow motifs, transparent orchestration and, frank, even clear tonal centre G major. I was a bit inspired by Hindemith's "Gebrauchmusik" since there is not enough concertos for euphonium to venture into experimental world of art (which is, frequently, terrible for ears and mind as well).