Sh*t happens. Especially if you want to achieve something that those really, really, really limited input devices (such as keyboards, mice and gamepads) simply aren't suited for. I doubt it will be much of a problem (difficulty-wise) for anyone who's even slightly into video games. Heh, I don't really know, but I doubt it. In any case, the warning seems appropriate, though. This is Advenure Gamers, after all.
Didn't like the phrases concerning hybrids and (hardcore)adventure gamers, but: Good job!
