I finished this recently, and it was really, really good. Developer Pastagames (Maestro: jump in music! Pix'n Love Rush!) really 'get' what Rayman's about by keeping everything fresh through changing level designs which complement Rayman Origins' gameplay but also the autorunner genre. Some truly inventive stages in there, and the land of the dead levels live up to their promise.
Back to the control issues though - using a mouse resolved all of my problems, luckily, and felt really natural as you don't have to cramp your hands around a keyboard to play. But it's a shame the keyboard wasn't used for anything other than space, as before I found a mouse my laptop trackpad+spacebar just wouldn't work properly (there'd be an annoying pause after I tap space before the game would recognise left trackpad click).