I know you're aware of the bug with the bird and the warning sign from previous comments, I just want to add that it is still playable and possible to work out how to avoid the bird after a few failures (maybe just a couple if you're astute enough). If anything I think it actually makes for a slightly better game, as it involves solving a little puzzle and requires some amount of strategic thinking. It's just that in the current presentation, it looks like a bug rather than a feature.
Anyway, good game and good concept. I like turtles.