Halo Zero is a fan made game that could possibly be ported into a portable format. And i dont believe it would be illegal like actually porting Halo so it seems possible to me.
New: fb2kPortable / foobar2000 (Apr 18, 2024), Platform 29.4 (Apr 10, 2024)
1,000+ portable packages, 1.1 billion downloads
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Please link to the game.
Simplifying daily life through technology
http://www.halozero.new.fr/ (Click on the "Games" Tab)
also can be found here: http://www.download.com/Halo-Zero/3000-7435_4-10474711.html
However, I believe it is freeware.
Please Make TiLP Portable