Until relatively recently in computing history, games (and all other programs) were small. Hell, Pokemon Gold fits un a floppy trivially compressed, together with a working GBC emulator. I can trivially fit rePalm unto a floppy and leave enough space for a great PalmOS RTS - "Warfare Inc"
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I disagree with your blanket statement. The vast majority of (commercial) PC games were never that small, even in the 3.5" heydays. Most games required 2-10 disks.
When PC really took off as gamming platform against Amiga and Atari ST, shipping games in CD-ROM was already a thing.
Amiga had plenty of single disk games.
PC? what pc?
Every single NES game or CGB game would fit on a floppy. More or less all GBC and SNES games could compress down to a floppy
At least in many European countries, game consoles were never that big during the 1980-90's, until PlayStation really took off.
However, and to go with your remark,
ZX Spectrum, C64, CPC, Archimedes, Amiga, Atari, plenty of games that would fit into a single floppy.
Off-topic: regarding Windows NT emulation challenge, now IA64 and AXP32/64 target are also somehow filled.