I have to say, some of the sound effects are annoying. And I don't like the "No Moves Left" screen when actually I have not enough crystals to continue. Having said that, this game has a very high level of polish, and I'd be failing in my duty to bring good games to other Kongregate users if I didn't give this a 5/5.
The ending was disappointing. I expected something dramatic about pressing the right arrow key, or perhaps something deep like "Well done. You've won. Now, you can keep going right for ever, or you can stop here. If you don't trust me, feel free to continue walking right for ever." That would have got more stars. As it is, it gets 3.
Oh. For those interested in actually getting the trophy, try playing through the entire series. You might get it, you might not... but it's awesome either way.
 "99 Bricks"){kind=icon}
 "Gravlogic"){kind=icon}
 "Storyteller"){kind=icon}
 "DropSum v2"){kind=icon}
 "pandas BIG adventure"){kind=icon}
 "Billys Big Adventure"){kind=icon}
 "Don't Shit Your Pants"){kind=icon}
 "Crush the Castle Players Pack"){kind=icon}
 "WalkRight"){kind=icon}
 "Hacker Testing"){kind=icon}
 "SHIFT"){kind=icon}
 "Canabalt"){kind=icon}