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you can jump on the platform to reach key and avoid ghost, thanks for playing

The ghost takes some trickery to get past. You have run (shift to run) under the platforms at first, and line up your nose at the right side of the second highest platform while waiting for the ghost to descend. The cat's tail isn't part of the hit box so you can let the ghost get fairly low before running back to get on the first platform. It's similar to dealing with the ghosts in the old Mario games.