Finished the game, wasn't too hard. The difficulty curve is just right and aside from the jumping (and even that only rarely) you never really feel cheated. Did get nauseous, though. Gave it 5/5.
Exactly 500 deaths, fairly proud of that. A nice little concept, and cleanly executed, too! Combine that with some really fitting music and you just got yourself 4 stars. Only thing I'd like to criticize is the difficulty -- It's pretty insane. I like that, especially since so many games these days are absolute cakewalks, but frustration is something a developer should strive to avoid, not create. Would've been 5/5 if it had checkpoints and an engaging storyline, although that much is just personal preference.
I really didn't like the way this game was screaming "tryhard!" right to my face. Dieing because of sloppy level design is not my favorite and neither is the mirror-screen mechanic, but I guess that's my own fault. 3/5.
What do you mean, "retry scene"? If you mean that you want to restart a level, you can press <Esc> and then any button to go back to the start of that area.
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You finished it :)