It's crazy that you put in multiplayer in such a short time! That being said, the attack hitboxes for the reapers never seemed to work for me. But still a really interesting concept!
It's probably working but you might not be rolling in the right range. Wish we would have had a tutorial or something to explain how to play. After the jam we'll have an updated version go out and it has a hit/miss text that flies off the enemies.