Sorry you ran into that issue. Yeah, that's a bug that I found the day after the jam submission ended, and happened due to my slapdash effort to slam the second level together in the last 20 minutes before the deadline, lol. Speaking to the Walrus clears an oil slick blocker on the west side of the level, which let you find your mom. But I forgot to add a check if the entity exists before deletion, so if you talk to him twice it sometimes tries to delete the (already deleted) blocker again, which causes the game to lock.
Thanks for the feedback! I'm glad you liked the art.