Complete a level, then press Space twice in a row on the next level. Voilà, the game is broken. Also, if you're sending us at the very beginning after a failure, you may as well just restart the timer.
Even clearing the cache doesn't get rid of the black screen for me. Almost sounds like the problem lies within the cookies instead. Which of course, we wouldn't want to delete.
@ravenmustdie: One is percentage-based, while the other is fixed. Say you have 100 AGI, and you get 100 exp per click. You will get +50% of 100, then an additional +50, for a total of 200. The fixed value is big early-game, but useless end-game.
@rasamon: Pretty sure they've never said that stats don't influence evolution. In fact, I remember seeing in occasional tips that they do, in fact, influence them. That'd be in addition with the rebirth count and the time you wait for the evolution, which I suppose would allow to reach further tiers.
At least give half a second delay before respawning! That instant respawn chains easily into more deaths! Also, I got the "complete all levels with 3 stars" medal, yet don't have the "complete 10 levels" and "complete all levels" medals.
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1.1 Uploaded and fixed the glitch, sorry about that!