Well turns out there was a bug where you use the "half a log" item on the bridge and it doesn't actually appear. I have updated the game and fixed that bug but if you don't want to re download the game simply skip to part two, you don't miss too much.
If you really want to see the end of part one, please re download the game (PS: you can copy your save file over to the new folder), sorry for the inconvenience.