diff --git a/vacuum_gambit.p8 b/vacuum_gambit.p8
index ddb1cd8..1e28a4e 100644
--- a/vacuum_gambit.p8
+++ b/vacuum_gambit.p8
@@ -885,6 +885,7 @@ player = ship_m.new{
  ymomentum = 0,
  maxspd = 2.5, -- momentum cap
  thrust = 0.25, -- momentum added from button
+ ymin = 0, ymax = 120, -- stay on screen
  drag = 0.125, -- momentum lost per frame
  slip = false, -- does not slide down screen
  act = function(self)  -- fetch buttons