add stripe, fix a sign error, some braking when crossing water at high speed

vacation.p8

@@ -411,6 +411,11 @@ function newtitle()
    end
   },
   bg.new{c=1},
+  bg.new{
+   y=28,
+   h=72,
+   c=5,
+  },
   box,
   toyphin.new(),
   {
@@ -615,7 +620,9 @@ function toyphin:update()
    -- maybe boost
    if dy > -4.125 then
     new_y = 64 + ((dy + y - 64)/dy * -4.125) 
-    dy = 4.125
+    dy = -4.125
+   else
+    dy = (dy - 4.125) / 2
    end
   else
    -- brake
@@ -636,6 +643,8 @@ function toyphin:update()
    if dy < 4.125 then
     new_y = 64 - ((dy - y + 64)/dy * 4.125)
     dy = 4.125
+   else
+    dy = (4.125 + dy) / 2
    end
   else
    --brake