diff --git a/entities/enemy.lua b/entities/enemy.lua
index 67a144d..cb16bd6 100644
--- a/entities/enemy.lua
+++ b/entities/enemy.lua
@@ -5,7 +5,9 @@ Enemy = Object:extend()
 local fireTime = love.timer.getTime()
 local enemyBullets
 
-function Enemy:new(x, y, radius)
+--int x, y, radius
+--playableArea -> {int[2]}
+function Enemy:new(x, y, radius, playableArea)
 	self.origin = { x, y }
 	self.image = love.graphics.newImage("/assets/enemy/e-fighter.png")
 
@@ -13,6 +15,8 @@ function Enemy:new(x, y, radius)
 	self.y = y
 	self.width = self.image:getWidth()
 	self.height = self.image:getHeight()
+	self.playableLeft = playableArea[1]
+	self.playableRight = playableArea[2]
 
 	self.type = "enemy"
 	self.health = 10
@@ -21,7 +25,7 @@ function Enemy:new(x, y, radius)
 	self.fireRate = 1
 	self.destroy = false
 
-	self.bounds = { (self.x + 18), (self.x + 44), (self.y + 20), (self.y + 44) }
+	self.hitbox = { (self.x + 18), (self.x + 44), (self.y + 20), (self.y + 44) }
 	enemyBullets = {}
 end
 
@@ -42,7 +46,7 @@ function Enemy:update(dt, player)
 
 	self.x = self.x + self.speed * dt
 
-	self.bounds = { (self.x + 18), (self.x + 44), (self.y + 20), (self.y + 44) }
+	self.hitbox = { (self.x + 18), (self.x + 44), (self.y + 20), (self.y + 44) }
 	--movement
 	if self.x > game_bounds[2] then
 		self.speed = -self.speed
diff --git a/entities/player.lua b/entities/player.lua
index c7efe12..21eac28 100644
--- a/entities/player.lua
+++ b/entities/player.lua
@@ -3,7 +3,7 @@ Player = Object:extend()
 require("blaster")
 local playerBullets
 
-function Player:new(x, y)
+function Player:new(x, y, playableArea)
 	self.image = {
 		{ "fullHealth", love.graphics.newImage("/assets/player/player01.png") },
 		{ "damaged", love.graphics.newImage("/assets/player/player02.png") },
@@ -15,6 +15,8 @@ function Player:new(x, y)
 	self.y = y
 	self.width = self.image[1][2]:getWidth()
 	self.height = self.image[1][2]:getHeight()
+	self.playableLeft = playableArea[1]
+	self.playableRight = playableArea[2]
 
 	self.type = "player"
 	self.health = 100
@@ -28,6 +30,9 @@ function Player:new(x, y)
 end
 
 function Player:update(dt, enemies)
+	local maximumLeft = self.playableLeft - 8
+	local maximumRight = self.playableRight - 38
+
 	--movement
 	if love.keyboard.isDown("left") then
 		self.x = self.x - self.speed * dt
@@ -36,6 +41,12 @@ function Player:update(dt, enemies)
 		self.x = self.x + self.speed * dt
 	end
 
+	if self.x < maximumLeft then
+		self.x = maximumLeft
+	elseif self.x > maximumRight then
+		self.x = maximumRight
+	end
+
 	--update bounds
 	self.bounds = { (self.x + 8), (self.x + 38), (self.y + 10), (self.y + 36) }
 
diff --git a/main.lua b/main.lua
index b003a9e..708ed18 100644
--- a/main.lua
+++ b/main.lua
@@ -1,18 +1,21 @@
-function love.load()
-	Object = require("scripts.classic")
-	require("entities.player")
-	require("entities.enemy")
-	require("ui")
+Object = require("scripts.classic")
+require("entities.player")
+require("entities.enemy")
+require("userInterface")
 
-	ui = Ui(600, 800)
+function love.load()
+	--adjust the screen and set the bounds of the UI
+	ui = User_Interface(600, 800)
 	local window_width = love.graphics.getWidth()
 	local window_height = love.graphics.getHeight()
+	local bounds = ui:returnBounds()
+
 	--place the player in the middle of the screen, close to the bottom
-	player = Player(window_width / 2, window_height * 0.9)
+	player = Player(window_width / 2, window_height * 0.9, bounds)
 
 	listOfEnemies = {}
 
-	table.insert(listOfEnemies, Enemy(100, 100, 70))
+	table.insert(listOfEnemies, Enemy(100, 100, 70, bounds))
 
 	--set background for space!
 	love.graphics.setBackgroundColor(27 / 255, 51 / 255, 85 / 255)
diff --git a/ui.lua b/userInterface.lua
similarity index 65%
rename from ui.lua
rename to userInterface.lua
index f61c922..cf2dad5 100644
--- a/ui.lua
+++ b/userInterface.lua
@@ -1,7 +1,7 @@
-Ui = Object:extend()
+User_Interface = Object:extend()
 
 --Set game canvas size
-function Ui:new(window_width, window_height)
+function User_Interface:new(window_width, window_height)
 	self.playableSpace = { window_width, window_height, (window_width * 0.25) }
 	self.score = 0
 
@@ -9,7 +9,7 @@ function Ui:new(window_width, window_height)
 end
 --set window size
 
-function Ui:draw()
+function User_Interface:draw()
 	local left_line = self.playableSpace[3]
 	local right_line = self.playableSpace[1] + self.playableSpace[3]
 	local window_height = self.playableSpace[2]
@@ -22,3 +22,8 @@ end
 --display the score
 
 --display player health
+
+function User_Interface:returnBounds()
+	--return left and right lines
+	return { self.playableSpace[3], (self.playableSpace[1] + self.playableSpace[3]) }
+end