Here is Danger from the Deep, the opensource WWII Submarine simulator

The game use gl4es and is heavily using shader. The game is pretty slow, even on a gigahertz Pandora, with the exterior view running at 4 fps. But the game is still playable.
You may need a swapfile for this to run (you certainly need a swap on CC model), and I don't expect the game to run on CC because of the shaders.
I only tested with the 4.10 SGX drivers. (beware not to zoomin too much initially on the map view, it may crash).

The game is very complex (and far from finished), so looking at the manual is strongly advised: http://dangerdeep.sourceforge.net/dangerdeep_manual.pdf

Keymap is not changed execpt "Time compression", that has been changed from "keypad +"/"keypad -" to "/" and "\"

History log
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Build 01
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* Initial build
* Modify 1 shader (int to float conversion)
* Some Pandora modification (fullscreen, keymap).

A htread is created here: https://pyra-handheld.com/boards/threads/danger-from-the-deep.82905/