interesting and unique mechanic, I think the switching was a pretty cool ability and liked how you used it to change the position of the key for the puzzle, but I didn't know what to do after getting the axe in 2d, because there's seemingly no way to go back without going back to 3d, which deletes the axe. I think completely deleting your inventory when you go from 2d to 3d works fine here, but it's not a really good mechanic if you want to expand on this later. I'd say making it save more stuff when you transition from 2d to 3d could make it a lot more interesting. For example, maybe saving the position of the player or the inventory would be cool, but it's a solid submission for now.