diff --git a/data/scripts/game.lua b/data/scripts/game.lua
index b865acf..b16cb1e 100644
--- a/data/scripts/game.lua
+++ b/data/scripts/game.lua
@@ -1,13 +1,17 @@
--- called every frame, with constant delta time
-local capture = false
-local Vector3 = require "vector3"
+local FONT = "fonts/Lunchtype21_Regular.ttf"
 
-local rot = 0
-local rot_spd = 0.05
+local Vector3 = require "vector3"
+local capture = false
+
+local head_rotation = 0
+local rotate_speed = 0.05
+
+local mouse_sensitivity = 0.01
 
 local spd = 0.07
 
-local pos = Vector3()
+local position = Vector3()
+local velocity = Vector3()
 
 local function Vector2(x, y)
     if y == nil then
@@ -39,33 +43,40 @@ function game_tick()
     if ctx.initialization_needed then
         -- ctx.udata persists on reload
         ctx.udata = {}
-        print(Vector3(5, 0, 0))
     end
     ctx.mouse_capture = capture
-    input_action{name="quit", control="SPACE"}
+    input_action{name="toggle_mouse", control="ESCAPE"}
 
     input_action{name = "left", control = "A"}
     input_action{name = "right", control = "D"}
     input_action{name = "forward", control = "W"}
     input_action{name = "back", control = "S"}
 
-    if input_action_just_pressed{name = "quit"} then
+    if input_action_just_pressed{name = "toggle_mouse"} then
         if not capture then
             capture = true
         else
             capture = false
         end
     end
-    local dir = Vector3(draw_camera_from_principal_axes{position = pos, yaw = rot}.direction)
+    
+    local dir = Vector3(draw_camera_from_principal_axes{position = position, yaw = head_rotation}.direction)
     dir.y = 0
     dir = dir:normalized()
 
-    local rot_d = b2n(input_action_pressed{name = "right"}) - b2n(input_action_pressed{name = "left"})
-    rot = rot + rot_d * rot_spd
+    if not capture then
+        local rot_d = b2n(input_action_pressed{name = "right"}) - b2n(input_action_pressed{name = "left"})
+        head_rotation = head_rotation + rot_d * rotate_speed
+    else
+        head_rotation = head_rotation + mouse_sensitivity * ctx.mouse_movement.x
+    end
 
     local mov_d = b2n(input_action_pressed{name = "forward"}) - b2n(input_action_pressed{name = "back"})
-    -- pos = trig.v3_add(pos, trig.v3_mult(dir, spd * mov_d))
-    pos = pos + dir * spd * mov_d
+    velocity = dir * spd * mov_d
+
+    position = position + velocity
 
     draw_billboard{position = Vector3(5, 0, 0), size = Vector2(1, 1), texture = "images/duck.png"}
+
+    draw_text{position = Vector2(0), string = "vel: " .. tostring(velocity), font = FONT}
 end
diff --git a/data/scripts/vector3.lua b/data/scripts/vector3.lua
index 0141e9c..7856d4d 100644
--- a/data/scripts/vector3.lua
+++ b/data/scripts/vector3.lua
@@ -129,6 +129,10 @@ function Vector3:length_squared()
   return x2 + y2 + z2
 end
 
+function Vector3:length()
+  return math.sqrt(self:length_squared())
+end
+
 function Vector3:normalized()
   local length = math.sqrt(self:length_squared())
   return Vector3(self.x / length, self.y / length, self.z / length)