Since 2004 I have released more than 150 cartridges for the TI-99/4A.
Almost all meet an 8K ROM constraint without need for any Memory Expansion.
Here are some of the latest. Download binaries
Blockbuster (game) V0.11
Restless II (game)
Piet Mondrian (demo) V0.4
Parallax Starfield (demo)
Snake Plissken (game)