Off he top of my head, games that'll fit on a floppy:

Solarian II (Absolute favorite game!) [shareware]

Delirium (Defender clone) [shareware]

ARASHI (Tempest clone) [shareware]

Glypha III (Joust clone) [shareware]

Color Dark Castle [Commercial; still for sale from Delta Tao]

Spaceward Ho! [Commercial; still for sale from Delta Tao]

Eric's Ultimate Solitaire [Free "Sampler" edition; Commercial; still for sale from Delta Tao]

Warlords II [Commercial]

CrystalQuest [Commercial]

Pax Empiria [Commercial]

Sim City Classic [Commercial]

Bolo [Freeware]

Games you should add when you get your HDD fixed:

Pirates! Gold [Commercial]

Wizardry VI: Bane of the Cosmic Forge [Commercial]

Sim City 2000 [Commercial]