COMPILATION ERROR in code action
Error in code at line 1:
    if ((hp -= 1) < 1) show_message('test');
           ^
at position 9: Symbol ) expected.

instance_create(x,y,obj_explosion)
instance_destroy()

if hp>0
{
hp-=1
with other instance_destroy() // удаляем пулю
}
else
{
with other instance_destroy() // удаляем пулю
instance_destroy() // удаляем врага
}

obj = instance_position(x,y,object_name);
obj.n += 1;