I'd say that I've been learning a lot from this side project of mine. I'm confident that when I've finished with it, I can go back to Gun and make it into a vastly superior mod. I might consider changing the Sector Black/White/Grey tracks, one of the ending themes and maybe the Phase 1 theme of the true final boss.
I might also consider updating the character sprites so they're taller maybe. But not too much, I don't want to have to redesign the levels to much to accommodate the new design changes.