What changes at every step
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Step 1SWIM -> SLIM
Tile 2 changes W to L; the move is sideways by letter shape. SLIM has 9 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from SWIM include SKIM, SWAM, SHIM, STIM.
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Step 2SLIM -> SLIP
Tile 4 changes M to P; the move is closer by letter shape. SLIP has 11 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from SLIM include SLAM, SLIT, SLID, SKIM.
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Step 3SLIP -> SLOP
Tile 3 changes I to O; the move is closer by letter shape. SLOP has 13 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from SLIP include CLIP, FLIP, SLAP, SHIP.
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Step 4SLOP -> PLOP
Tile 1 changes S to P; the move is closer by letter shape. PLOP has 11 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from SLOP include FLOP, CLOP, GLOP, SHOP.
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Step 5PLOP -> POOP
Tile 2 changes L to O; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from PLOP include PROP, PLOT, FLOP, PLOW.