rRootage is an open-source "bullet hell" abstract style shoot-'em-up written by Kenta Cho from Japan, ported to GP2x by Senor Quack.
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Dingux-GO is a port of GNU-Go 3.6 on Dingoo/Dingux with a GUI.
Alien Arena was developed by Duncan Brown in 1984 to run on the classic Williams hardware. It is a "capture the flag" style game with a number of interesting twists.
Plants vs Zombies is an adaption of the commercial Windows game "Plants vs Zombies" by Popcap Games (more information here: http://www.popcap.com/games/pvz/ ).
PlanetoiDS is a classic Mastermind board game with a retro-spacey setting.
Stylus Maze is a game where you need to master a parkour without hitting the sidewalls.
Stray Cat DS is a run-'n'-jump platform game with the goal of getting the cat, Flash, to his date with the cutest kitty at downtown.
RPS-DS (Rock Paper Scissor-DS) by Metatarsals is another RPS game for Nintendo DS.
"Plane Popper" is a simple flight game in which you pilot a small bi-plane and collect balloons. Control the altitude of you aircraft with the D-pad or Stylus to avoid obstacles such as flying brick blocks. Careful not to fly too low though, if you crash into the trees you will lose a life and be re-spawned in the middle of the screen. More and more blocks are added as your distance increases making the game get increasingly difficult. Also, be prepared for a surprise when your distance reaches 5000.
"Peter The Beaver" is a neat platformer currently under development. Goal is to collect all cherries, which are spread all over the level. Be aware, Peter has enemies too!