I am unable to get past the summer section at night. Is this the end? I like the game and selfishly want more.
That was definitely a bug! It seems Bitsy moved the exit somewhere inaccessible, for reasons I don't fully understand.
An updated version of the game has been released, so now you should be able to reach the autumn and winter parts. Thank you for your kind words, and I hope you enjoy the rest of the game.