I had found the Amiga version last week on one of my floppies, and it does take a lot to get use too, as to jump, you just press up on the joystick. I guess I am hardwired to press a fire button when I want to jump. I found it frustrating to play.
I don't know if mine was a demo or what, but it didn't need any conversion to NTSC, it just worked fine with my A1200 and 1084s monitor.
EDIT:
Opps, sorry, its just too early in the morning here. I was talking about Giana Sisters, not BT.. Sorry, The Giana Sisters was also released for the Iphone recently.
and interesting side note is that some talented developer also ported Lemmings, but Sony blocked it and threatened lawsuits.
Lemmings would be a perfect game on touch screen for the Ipad. Stupid Sony.