Nyan Cat FLY! has done gone gotten a grand total of 4 MILLION PLAYS in teh interwebs. This makes me, as the developer, very happy. And to show that happiness, I've released ALL the secret codes available in Nyan Cat FLY! for people to see! All 26 codes have been revealed, allowing you to mess with Nyan Cat in ways previously unimagined!

See the full code list here. JayIsGames has lovingly written a brief article containing a review of the game and a list of the secrets.
www.jayisgames.com/archives/2011/07/ny an_cat_fly.php

Play the game here

<3 Nick Yonge
MCS-EOOEJ, krangGAMES
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And now, for further celebration, here's some math.

Considering that the average gameplay session lasts 0:40s, and as of this writing there have been exactly 4,025,390 plays, this means:

161,015,600 seconds of total consecutive Nyanning
2,683,593.33 minutes of total consecutive Nyanning
44,726.56 hours of total consecutive Nyanning
1863.61 days of total consecutive Nyanning
5.11 years of total consecutive Nyanning

And the average user session (including menu browsing, typing in cheats, customizing Nyan Cat, etc) lasts for 8:37, or 517s, which means that Nyan Cat FLY! has been active for a collective total of 66 years. That's just shy of the total average human lifespan.