Under Preferences -> Configure Controls I can see the keys and am able to redefine'em (see screenshot).
Did you try to redefine the keys?
To learn special combinations, you may take a look at raw tutorial text, it's in /usr/game/hurrican/english.lng
The problem is that, for some reason, those "constants" like KEY_LEFT aren't converted and displayed as a real keys during the tutorial...//---------- Tutorial Texts ----------//
Welcome to the Hurrican tutorial level. Here you'll learn the basic controls. You can move left and right by pressing KEY_LEFT or KEY_RIGHT. You can crouch by pressing KEY_CROUCH. Now look around a bit. There are more hints like this in this level.
[...]
Greetings!