This was sweet! The atmosphere was really pleasing to look at. One little bug I ran into was I could still stand and wall jump on hidden walls, even when I didn't have the Donnel mask on. Other than that though, this was a really fun game :) Great job!
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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!