It's hard, specially since it feels slippery, but once you get the hang of it, it kind of grows in you. I'm glad that you can restart the level with 70%. It has replay-ability potential if you want to create your own challenges like clearing the whole game without using continues and the leader board with the infinite is great, I managed to get to 900 but is also rather stressful so I had to stop for my own sake.
The art is very cutesy and that is always a plus for me n.n
My favorite part: Although it is short the gameplay has a nice rhythm of spacing your movement, attacking and stopping time to clear more enemies which is very engaging.