Thanks! I think it's intended to be rotated but it's true that it's a bit ambiguous, perhaps we should provide something more suitable but it could quickly take up a lot of space in the tileset, or perhaps have a separate tileset for transitions.
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That might be good. I will look into rotating some for now. A suggestion: I think it could be nice if the animals' spritesheets were expanded to include all the various walking states/animations, including up and down, just like other characters such as monsters. It's probably not super important for animals to have all the states though.