I feel a bit diiferent since the style was different from other fangames, but this game ended becoming a pretty nice surprise!!
But hey, the original musics are somewhat ok since the game not follows exactly how NES megaman games are, but did you even considered adding megaman-like musics in your game as an alternate soundtrack? there's literally hundreds of free-to-use megaman-styled musics on youtube from the most varied and talented composers, like Threxx, Hertzdevil, keviiiiin, cosmicgem, MelonadM just to point few!! thank you so much!!