The speed is more than reasonable on my A1200/030 .The truth is that I was impressed
with the control response and the enemies intelligence well achieved,good job
However still there are many bugs to be polished: the fall when hit in the air,grab an enemy instead of falling to the ground after a blow,small flickering,weird shadow color in the player,weird colors in the background,etc.
Personally I wish it was an original game rather than a conversion.There are people here who could help you make the graphics I think.
EDIT: I've been comparing it with the conversion ocs/ecs and I've noticed that you've reduced the size sprites from the original.The gameplay yours is closer to the arcade than the ocs/ecs version although it doesn't fit in some details.Your version has music, more sounds,more speed and more animation frames I think.