With apt-get, just installing a SMALL portion of the debian repository, I quickly filled up my 2GB image file. You can start with
sudo apt-get bsdgames. It even has an ncurses-based tetris, besides the old "teletype" classics trek and adventure (i.e. colossal cave)
You can also add other package repositories to apt-get, and you can use ipkg or opkg to install smaller packages from the optware repositories.
I even installed qemu, and ran MS-DOS inside it using ncurses text mode, but there were some issues with eink and white-on-black characters. You needed to change the screen colors in DOS to make it usable.
And you can install gcc and the other full build utilities. Whatever you want, basically...
