Thanks for your review.
Apparently we made it not clear enough, but each weapon says what it targets. Most weapons will fire at the closest enemy but others will fire differently, like the crossbow: It will always fire north of the player so you will need to make sure you are south of an enemy at the cooldown to make sure it hits.
It was our way of getting more variety in the weapons but having most weapons auto target enemies I can understand the confusion :)