What do you mean?
EDIT: Oh I may have been slightly a dingus here.
Thinking about it now, I imagine people playing this title on a handheld may have trouble pressing the (<-) and (->) buttons at the same time...
I'll release a quick fix for this tonight. I imagine changing it from:
(<-) + (->) to something like (X) + (^) might work.
Thanks for bringing this to my attention!