I'm glad you liked the game and thank you for this long and constructive comment !
I've really been focused on the gun feels for this game so yeah there is no score or things like that because I didn't had the time since I was so focused on the game feels. The music reset because you can "win" the game if you survive until the end of the music (it last a bit more than two minutes I think) but it wasn't really clear at all how I presented it. And yeah it caught many people of guard being killed by corpses, it's an important mechanic that force you to be very careful with your gun recoil. And I wanted to add a system so you can't have the same gun twice but I was already at more than 4 hours of dev so I left it like that. And I wasn't counting the time where I was actually playtesting the game to tune the difficulty or when I added the sounds since I didn't made them. My goal wasn't to make the game in three hours, I knew I would go overtime from the start, I just wanted to try to make a game where shooting was fun and the guns were great ! (And I wanted to add a Noir film aesthetic because I like that !)