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).
Pretty lovely although at around 1:15 the progression is way too banal (A-b-G-D). I prefer other moments where harmony is more open although firmly in tonality. Nice, memorable motivic features also help the musical development.