Bumping this up because the first review is up. "Alley Cat" if anyone remembers that little gem.
A game which despite being made in 1984, still works with correct timing on current machines! alas, up until XP it runs just fine, but Vista doesn't support fullscreen DOS apps anymore.
Surprisingly enough, it's probably the only classic from my childhood which still manages to amuse and entertain me today without resorting to nostalgia. Top notch gameplay, very imaginative, and still incredibly cute.
I can't think of another PC game which stands so well to the test of time. And it was less then 64kb too.