Lemmings
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When you start a level, it is best if you send a couple of Lemmings ahead to
clear the way for the rest. Operate your blockers to keep the rest back.
If the second Lemming is too close to the leader, then let him build anywhere
to make a bigger gap between them.
On some of the overhead pieces of land you are better waiting until all your
Lemmings have come out of the trap doors before operating a digger. This can be
done with a blocker at each end, the diggers can then dig diagonally down, so
that the rest of the Lemmings don't have as far to drop.

Awesome
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Space Combat - Flying backwards when being pursued by ships sometimes helps, as
you can shoot them without going any slower.
When collecting disk's or shield pods, go for the one on the left or right