Once you pick up a bonus, there should be a way to select that bonus as the one you want to use. Gets really frustrating making sure to dodge other bonuses.
Well, the game has bugged, and won't let me complete the first level. If I move in either direction, I go immediately to the limits of the screen, my mana doesn't decrease when I use the default combat spell, and m,y soldiers never seem to show up when I recruit them.
Updated