This is such a shame in my opinion. I love the graphics and the artwork so much. The mouse certainly has the charm to it. The animation also feels nicely done too. The combat system pairs nicely with the animation, but if the animations were a bit faster, had clearer timing of attack and hurt boxes, it would be much more enjoyable. Another thing is that the game throws you directly into the action without any setups and tutorials makes understanding how to play a bit harsh. I for one point thought the first enemy was the tutorial dummy :( Also, the elephant in the room is that the game really hurts by lacking any music and sound effects, just a bit of that added would be really nice.
Anyway still, good job in making the game. Keep up the good work!