Here is Kroniax, a game based on reflexes that can be similar to FlappyBird.

This is the C++/SFML version, using glshim (there is also a Java/libgdx)

The game is fast and smooth, even on CC model (I use a 800Mhz overclock, but I think it should be fine at regular 600MHz), and is like if it was designed for the pandora (screen size of the game if 800x450).
Unfortunatly, the game is unfinished, with only 9 out of 16 levels done (and only 2 out of 4 tutorial levels).
Still, the game is nice and challenging.

Instead of Space, you can use (X) also.

History log
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Build 02
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* Added Tear-free hack

Build 01
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* Initial build
* Forced fullscreen

A thread is open here: https://pyra-handheld.com/boards/threads/kroniax.76968/