Updated Tutorial:Your first game in Ebiten (markdown)

Tutorial:Your-first-game-in-Ebiten.md

@@ -4,7 +4,7 @@
 
 ![](http://i.imgur.com/NPbjFJp.png)
 
-And Ebiten is a cross-platform library, which means you can run Ebiten on these platforms:
+Ebiten is a cross-platform library, which means you can run Ebiten on these platforms:
 
 * Desktop: Windows, Mac OS X, Linux
 * Mobile: Android, iOS
@@ -17,7 +17,7 @@ There're already [some examples available on the website](https://hajimehoshi.gi
 Before we get started, you would need to `go get` the Ebiten package:
 
 ```bash
-:; go get github.com/hajimehoshi/ebiten
+:; go get github.com/hajimehoshi/ebiten/...
 ```
 
 # Write your first game with Ebiten
@@ -26,14 +26,14 @@ Once you got the Ebiten package, you can start to write your own game with Ebite
 
 ## Import Ebiten
 
-We'll use Ebiten in our program, so the first thing is to `import` the Ebiten package which we `go get` before, so put this code at the top of your program.
+We'll use Ebiten in our program, so the first thing is to `import` the Ebiten package which we `go get`-ed before, so put this code at the top of your program.
 
 ```go
 package main
 
 import (
     "github.com/hajimehoshi/ebiten"
-    "github.com/hajimehoshi/ebiten/ebitenutil"
+    "github.com/hajimehoshi/ebiten/ebitenutil" // This is required to draw debug texts.
 )
 ```
 
@@ -56,18 +56,20 @@ But hey! It's not done yet, because you'll need to tell Ebiten to run your `upda
 
 ## Initialize Ebiten
 
-It's time to configure Ebiten through `ebiten.Run(update, width, height, scale, title)`. This tells which function to loop, what title of our game is, and the size of the window.
+It's time to configure Ebiten through `ebiten.Run(update, width, height, scale, title)`. This tells which function to loop, the size of the window, and what title of our game is.
 
-* `update` is the parameter that you would need to pass a function which will always be called at the each of the frame, and yes! We will pass our `update()` function though here.
+* `update` is the parameter that you would need to pass a function which will always be called at the each of the frame. We will pass our `update()` function though here.
 * `width` and `height` are the width and the height of the game window.
 * `scale` is the value that will scale your game window, for example if you set it as `2` and draw a `16x16` canvas on the screen it'll be rendered as 32x32 (twice larger).
 * `title` is the title of the game window.
 
-So what are we waiting for? Let's write the following code in your `main()` function!
+Let's write the following code in your `main()` function!
 
 ```go
 func main() {
-    ebiten.Run(update, 320, 240, 2, "Hello world!")
+    if err := ebiten.Run(update, 320, 240, 2, "Hello world!"); err != nil {
+        panic(err)
+    }
 }
 ```
 
@@ -75,7 +77,7 @@ This will generate a 320x240 game window and it will be scaled twice larger (so
 
 # Review
 
-Here's the fully example, it's short, isn't it?
+Here's the fully example:
 
 ```go
 package main