Number + not increasing past 1

Help Requests
1

I can’t get the + input of a number block to increase the number.
I’m trying to make it so that when 3 enemies are destroyed, a key is emitted.
On collision with the enemy, hit outputs to + in a number block. It increases the number when the first enemy is destroyed, but does not increase when the next enemy is destroyed. Please help.
number+

Here is my game
http://flowlab.io/game/view/1335695

2

hey @stemminds - Each enemy gets it’s own copy of the behaviors. When one enemy dies, only his Number block is incremented. All the other enemies are still at 0.