RED update thoughts and feedback

I thoroughly enjoy Mesoranger DDR. Does anyone know what the reward for defeating the enemy is? My team never seems to be able to defeat it, I can get S in Hard mode while my entire team gets B's in Easy mode. Also, would an SS at a lower difficulty equate to more damage with the FEVER and FEVER X 2!!!? Maybe I am the one hampering our success.

In case anyone is dissuaded by the challenge, let me dangle untimed no-boom 50% Chaos Scroll of Goodness at you. I can confirm they come from the boxes.

It is a shame this will be gone after today, at least temporarily.

Do the boxes give RED coins? I would hope so since the minigame is originally from the first RED patch, but they may have taken it out. I really need more sources of coins.