I made a quick bugfix release. These bugs are pretty annoying, so I would suggest you download it. Here's some gifs to entice you!
== 1.3.1 CHANGELIST (Mar 16 2013) ====Bugfixes only... but important bugfixes!
- Fix : A bug in joystick detection code made it so that keyboard-controlled co-op players would always attack towards the mouse pointer if no joysticks were connected
- Fix : Elite enemies (depth 5 and lower) were much less elite than intended. They now have x2 the hitpoints and do x2 the damage of normal enemies.
- Fix : If a new player joins mid-game, they will no longer join unarmed.
- Fix : Origin of bullets for special attacks would sometimes be in the completely wrong direction.