Delete slip behavior

vacuum_gambit.p8

@@ -530,8 +530,6 @@ ship_m = mknew{
  shieldpenalty = 0x0.012c, --5s
  shield_refresh_ready = 0,
  
- slip = true,  -- most enemies slide
- 
  xmomentum = 0,
  ymomentum = 0,
 
@@ -621,15 +619,7 @@ function ship_m:move()
 
  self.x += self.xmomentum
  self.y += self.ymomentum
- 
- -- "scrolling" behavior
- if self.slip then
-  self.y += scrollrate
-  if self.y >= 128 then
-   self:die()
-   return true
-  end
- end
+
  return false
 end
 
@@ -1189,7 +1179,6 @@ player = mknew(ship_m.new{
  thrust = 0.1875, -- momentum added from button
  ymin = 0, ymax = 120, -- stay on screen
  drag = 0.0625, -- momentum lost per frame
- slip = false, -- does not slide down screen
  act = function(self)  -- fetch buttons
   local b,th = btn(),self.thrust
   local blr = b&0x3
@@ -1345,7 +1334,6 @@ chasey = mknew(ship_m.new{
  maxspd = 2,
  thrust = 0.2,
  drag = 0.075,
- slip = true,
 
  init = function(ship)
   ship.main_gun=ship.main_gun or zap_gun_e.new{}
@@ -1373,7 +1361,6 @@ xl_chasey=mknew(chasey.new{
  hp = 19.5,
  shield = 5,
  boss = true,
- slip = false,
  act = function(self)
   local dx,dy,shoot_spec,shoot_main = chasey.act(self)
   if (self.y < 4) dy=self.thrust
@@ -1401,7 +1388,6 @@ ship_f = mknew(ship_m.new{
  maxspd = 3,
  thrust = 0.1,
  drag = 0.05,
- slip = false,
  act = function(self)
   local wx,wy=self.want_x,self.want_y
   self.xmin,self.xmax,self.ymin,self.ymax = wx,wx,wy,wy