I like the idea a lot! But I found it too hard to control the ball and the character at the same time, dodging and attacking. The controls can use some refinement, which would make the whole dynamic easier to perform.
Maybe you could do more like Katamari and have only the ball/reaper to control, just something like when you hook the ball and it got stuck on the reaper (that seems like a bug atm). Joining those as one character would make it a lot easier to manage! Just an idea :)
Death can die so 0/10 (just kidding! xD). Great job for your submission!