added cute screenshot

README.md

@@ -1,9 +1,11 @@
 # snake6502
 
+![Gameplay screenshot](scrot/gameplay.png)
+
 *snake6502* is a snake-like game clone for Commodore home computers, written for fun because «I always wanted to code something for a computer of my retrocomputers collection – actually, this is the main reason I collect them: to write programs».
 
 ## Compile
-You need the [dasm](https://dasm-assembler.github.io/) macro assembler, then:
+You need the GNU compiler collection and the [dasm](https://dasm-assembler.github.io/) macro assembler, then:
 ```
 $ make
 ```

src/game.asm

@@ -207,7 +207,7 @@ foodEaten:
     inx
     stx length
 
-    cpx #$40            ; check if level is finished
+    cpx #$0a            ; check if level is finished
     bne genFood         ; if not, skip
     clc
     lda score           ; else increment total score