I really love the idea of this game. However I had a few issues that made me really annoyed.
1. When swinging if you let go you kind of lose your momentum which feels kind of awkward
2. The random fireballs seemed more of a headache than they should be. For example I would kill an enemy then bounce straight up into a fireball and not have any time to react.
Overall though I think this was a really good game. I loved the style of it and chaining swinging and killing enemies felt really good when I could get it!