Hi UrbannB - I adjusted the missile speed and adjusted the fast forward speed. This seems to greatly improve the missiles catching their intended targets.
Hi ozzie1416 - If you click the gear icon in the upper right hand corner it opens the menu. You have the ability to restart your current level in that menu. After you complete a level or lose a level the menu should popup and you have the option of replay as well. Ill add how to get to the menu to the instructions thanks for your comment.
 "Unity Defense"){kind=icon}
 "Viking Raiders"){kind=icon}