Here is the nuance. Broforce is developed by Free Lives and published by Devolver Digital. There is "portable version" distributed by the devs.
: Developer Free Lives originally hosted a free browser-based web alpha that gives a good feel for the full game without a download.
When searching for "Broforce free play portable," many results point to "cracked" versions or browser-based emulators. We recommend avoiding these for several reasons:
Here is a descriptive feature piece capturing that experience.
But here is the problem: Broforce is so addictive that you never want to stop playing. What if you could take that explosive chaos on a USB stick? What if you didn’t need to install anything?