I like the concept. The combat feels good though enemy animations are too slow (it doesn't feel like you're hitting them), but the platforming is awkward (I keep hitting platforms with my feet and falling all the way down, which isn't fun when time is ticking away).
I disliked the controls and couldn't find a way to control it (controller support would be good, I'm assuming there isn't because my controller didn't work at least on the web version). With my right hand occupied by J and K, my poor left hand has to use WASD to move, Space to jump, as well as Shift to dash - I found it just too awkward to dash most of the time.