This would be much more enjoyable if the action buttons were not mapped to Enter/Space but to A/B/X/Y. (EDIT: Never mind, I just noticed that I can remap the controls... oops)
I don't think that the cloning is entirely accurate, though... in the Gameboy version of Castelian, I could get to the second elevator in the first level before that energy ball came at me from the right. Here, it's impossible to make it in time.