I understand how that may appear to be a bug - honestly a thing that we could have made more obvious as being an intentional part of the gameplay - but you "can" navigate/get blocked by hidden walls (like in the item collection rooms, you get blocked by them and can end up dying if not using the correct mask) - but it was indeed intentional part of the design - just not fully fleshed out due to jam scoping.
Glad you still enjoyed it!