Hmm im not sure you need to worry about the ending - in video game music it usually a good idea to have a song that can loop forever… and just fade between tracks.
Obvious you can do much more complex and clever things but thats the eaisest way that sounds professional…
I like the tune another chill v relaxing one…
I would be tempted to maybe good full wind quartet and add in a flute clarinet and oboe, then you could really get some oomph in the chorus…Kinda like fatter… umm maybe this is good for ideas…