double click the button to move them like the others menu buttons, i guess its not so intuitive ,il change it to be 1 click.
EDIT:
a new version have just been uploaded, one of the new changes are a better explanasion of how to use the soldiers movement.
Game could be more interactive and give more rewards by clicking special things. not only bat but the flying witch, a running cat, a hovering ghost, a frantic zombie etc... You could also be able to enter house and do stuff like decoration and do short quests.
You always can use walkthrough (the question mark icon in the lower right corner).