diff --git a/ants/main.lua b/ants/main.lua
index fd8e89a..ae96e21 100644
--- a/ants/main.lua
+++ b/ants/main.lua
@@ -31,6 +31,8 @@ end
 local function initColors(rules)
   rules = rules:lower()
   local colorbrewer = require("colorbrewer")
+  -- set a specific random seed to avoid picking the same palette every time
+  math.randomseed(os.time())
   local scheme = colorbrewer.random()
   local variant = scheme[#rules]
   COLORS = {}
@@ -52,7 +54,6 @@ local function initScreen()
     love.graphics.setColor(color)
     love.graphics.rectangle("fill", 0, 0, WIDTH, HEIGHT)
   end)
-  UNITS = 8
 end
 
 local function initAnt()
@@ -81,6 +82,8 @@ end
 
 function love.load(args)
   local rules = args[1] or "RL"
+  UNITS = args[2] or 8
+  STEPS_PER_FRAME = args[3] or 5
   initColors(rules)
   initScreen()
   initAnt()
@@ -117,32 +120,34 @@ end
 
 function love.update()
   require("lurker").update()
-  local c = nextColor()
-  ANT.direction = rotate(ANT.direction, c.clockwise)
-  CANVAS:renderTo(function()
-    love.graphics.setBlendMode("alpha")
-    love.graphics.setColor(c.rgba)
-    love.graphics.rectangle("fill", ANT.x, ANT.y, UNITS, UNITS)
-  end)
-  if ANT.direction == "u" then
-    ANT.y = ANT.y - UNITS
-  elseif ANT.direction == "r" then
-    ANT.x = ANT.x + UNITS
-  elseif ANT.direction == "d" then
-    ANT.y = ANT.y + UNITS
-  else
-    ANT.x = ANT.x - UNITS
-  end
+  for _ = 1, STEPS_PER_FRAME do
+    local c = nextColor()
+    ANT.direction = rotate(ANT.direction, c.clockwise)
+    CANVAS:renderTo(function()
+      love.graphics.setBlendMode("alpha")
+      love.graphics.setColor(c.rgba)
+      love.graphics.rectangle("fill", ANT.x, ANT.y, UNITS, UNITS)
+    end)
+    if ANT.direction == "u" then
+      ANT.y = ANT.y - UNITS
+    elseif ANT.direction == "r" then
+      ANT.x = ANT.x + UNITS
+    elseif ANT.direction == "d" then
+      ANT.y = ANT.y + UNITS
+    else
+      ANT.x = ANT.x - UNITS
+    end
 
-  if ANT.x >= WIDTH then
-    ANT.x = 0
-  elseif ANT.x < 0 then
-    ANT.x = (WIDTH - 1) - ((WIDTH - 1) % UNITS)
-  end
-  if ANT.y >= HEIGHT then
-    ANT.y = 0
-  elseif ANT.y < 0 then
-    ANT.y = (HEIGHT - 1) - ((HEIGHT - 1) % UNITS)
+    if ANT.x >= WIDTH then
+      ANT.x = 0
+    elseif ANT.x < 0 then
+      ANT.x = (WIDTH - 1) - ((WIDTH - 1) % UNITS)
+    end
+    if ANT.y >= HEIGHT then
+      ANT.y = 0
+    elseif ANT.y < 0 then
+      ANT.y = (HEIGHT - 1) - ((HEIGHT - 1) % UNITS)
+    end
   end
 end
 
diff --git a/flake.nix b/flake.nix
index 3456852..631768f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,7 +22,7 @@
             name = "love";
             packages = [ love ];
             shellHook = ''
-              mkdir vendor
+              mkdir -p vendor
               ln -snf ${lume}/lume.lua vendor/lume.lua
               ln -snf ${lurker}/lurker.lua vendor/lurker.lua
             '';