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It's intentional. But it was designed as a game over thing after everything else has been completed, so the user can crash out before leaving. The problem is one of balancing, it is too easy to get to the final bird level. You seem to have got most of the upgrades though, so you're as good as finished. As long as you enjoyed the journey, might as well blow up the destination. :)

Oh, yeah I definitely got the birds too early, but it was a fun game! I enjoyed it before Chrome wanted to tap out.