I felt a sense of stagnation between the first HARD level and level 13.

Like, okay, the game teaches me to think about the “importance” of sequence/order, so I lost the HARD level about 3 times. But after that, I just keep clicking without really solving or thinking about anything, even though the expectation is that now I’ve learned the skill of “thinking about which sheep to send first.” But that never really happens again until the key mechanic appears, which also seems like it’s supposed to teach me to think about which sheep to send first — but then it also ends up not really mattering.

On level 13, the red and blue sheep block each other, so it becomes impossible to pass.