Ok, from your description it sounds like you were testing a completely different game, not sure why. Have you uploaded the latest version?
As for the sounds, there are no sound settings, so I can't really make the interaction sounds louder or music quieter. I've checked again, and indeed, there are very quiet and short sounds, and it seems that only one sound is playing at a time, so if you repeatedly press attack, attack sound just prevents any damage sounds from being played (I'm not sure it works like that, but that's what I see)
As for the hitboxes, I've recorded a gif for you:
No real need to remove melee, I actually used it in my play attempts.
My problems with controlling the character were with horizontal acceleration (including in the air). Probably I'm used to being able to gain full speed/stop faster.