Solution in Python based on La blatte's wonderful implementation if anyone is interested!
def snail(arr): return arr[0] if len(arr) == 1 else [*arr.pop(0), *[elem.pop() for elem in arr], *arr.pop()[::-1], *[elem.pop(0) for elem in arr[::-1]]] + snail(arr) if len(arr) else []
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Solution in Python based on La blatte's wonderful implementation if anyone is interested!