Nice idea, and the (somewhat) slow pace plus relaxing music is really...relaxing haha.
Of course the bug that causes the second level to not load is annoying but understandable. That is what happens with these GameJams. But i wonder if the second level would have made use of the birds ability to go back/forward, as the first level(and the mini level after that) can easily be completed just with up/down movements.
Though personally(!) i dislike this auto-scrolling format and think a game where you would have to fly forward yourself, with more complicated puzzles, would have been more fun. Try to think about this.