What changes at every step
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Step 1PETS -> POTS
Tile 2 changes E to O; the move is closer by letter shape. POTS has 15 legal neighbors, 2 shortest continuations, and 4 moves remaining. Other legal exits from PETS include BETS, PEES, SETS, GETS.
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Step 2POTS -> COTS
Tile 1 changes P to C; the move is temporarily farther by letter shape. COTS has 18 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from POTS include BOTS, LOTS, DOTS, POPS.
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Step 3COTS -> COOS
Tile 3 changes T to O; the move is closer by letter shape. COOS has 15 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from COTS include CONS, COPS, COWS, BOTS.
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Step 4COOS -> COOP
Tile 4 changes S to P; the move is closer by letter shape. COOP has 14 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from COOS include COOL, COOK, BOOS, COOT.
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Step 5COOP -> POOP
Tile 1 changes C to P; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from COOP include LOOP, HOOP, BOOP, GOOP.