Haha, yes, you played on one of the maps with broken navigation. I have a disclaimer in the description explaining to avoid that. I really wish GMTK allowed for small changes to fix game-breaking bugs like Ludum Dare does. It really is a 5 second fix.
There are 5 maps and the first two have broken navigation due to a bug in my navigation building code. I added the extra levels at the last minute and by chance I didn't play any of the broken maps while testing. I played on two of them and they worked, so I assumed the rest also worked since it was all using the same code. Whoops.
You can refresh and get one of the maps that work.