The first is a side scrolling shooter called
Tumiki Fighters. It is like any other space shooter, only your ship is a kind of Tetris piece and, when you knock pieces off your enemies, you can add them to your own. It is pretty trippy.
The next is called
kkrieger (not a type-o, I swear). It is a first person shooter in 96k. Now, the slashdot people knocked it for using DX9, which is 20 megs, but I figure if I don't have to download it, it doesn't count.
And one of the best puzzle games I have played in a while is
Deadly Rooms of Death. It is a really well thought out game, and very... um... dastardly.
These things can be gotten from the usual place.