Add a retry option after you die. I dont need to look at hte scoreboard every time. Also you might want to limit the length of curves it really sucks to have one run your mouse right off the table.
Your instructions are less then worthless since the button combos dont even do what you say they do. I dont feel like playing enough to guess and check what the actual controls are
The accuracy gets a bit wonky at times and some levels are near impossible to get the combo metal on because enemies simply come to few and far between.
Give us an option to disable combat animations. They are nice to start but after a couple hundred times they start to get boring. Then by the time you get out of the second dungeon you want to kill the animator.
Change the sensitivity :) also I'll definitely add a quick restart option :)