I was just looking around the GP2X wiki to see what PC games had been ported to it; I know that the Dingoo and the GP2X have rather different specs, but they're similar enough that something possible on the GP2X should be possible on Dingux.
Among the many, many homebrew games, I found some cool computer games that haven't been ported to Dingux yet...
Transport Tycoon Deluxe! (http://wiki.gp2x.org/wiki/TTD2X)
Heart of the Alien! (http://wiki.gp2x.org/wiki/Heart_of_the_Alien)
Aleph One! (http://wiki.gp2x.org/wiki/Aleph_One)
Nethack! (http://wiki.gp2x.org/wiki/Nethack_%28graphical%29)
Jazz Jackrabbit! (http://wiki.gp2x.org/wiki/OpenJazz)
The Ur-Quan Masters! (http://wiki.gp2x.org/wiki/The_Ur-Quan_Masters)
X-Com: Terror from the Deep! (http://wiki.gp2x.org/wiki/X-COM:_Terror_from_the_Deep)
X-Com UFO Defense! (http://wiki.gp2x.org/wiki/X-COM:_UFO_Defense)
Warcraft! (http://wiki.gp2x.org/wiki/Warcraft)
Descent! (http://wiki.gp2x.org/wiki/D1X-Rebirth)
Hexen 2! (http://wiki.gp2x.org/wiki/2xhexen2)
Albion! (http://wiki.gp2x.org/wiki/Albion)
C-Dogs! (http://wiki.gp2x.org/wiki/C-Dogs)
Dune 2! (http://wiki.gp2x.org/wiki/Dune2X)
If these games were possible on the GP2X, then they're almost certainly possible on the Dingoo.