I loved Yoshi's Island final battle so it was great to see this.
I just don't get why would you set the main attack as "o", "r" or left mouse button, it's a strange setting.
Some mechanics make no sense, jumping could work if the secondary suika attack went through all the floor, it could be nice to slow down your movement to increase accuracy, maybe using shift as in the touhou games, also, Suika's movement is kinda broken because in my second playthrough she went all the way to the left, to the point she was unreachable.
Other than that, way to go, it's quite good.