In 50 moves, make all the ghosts disappear. The first six ghosts are easy to handle and should be taken care of accordingly. There is no point in rushing towards the bottom to catch the Tombstones in time as there are rows upon rows of double Iron and Golden Blockers. We can also forget the gifts at the bottom unless there’s a lucky match down there in the first turn.
In any case, don’t worry about the small amount of space available at the start. A match-3 or 4-in-a-square will always be available.