Ok, package is on extras-devel, name is 'powdertoy'

Game runs at ~20 fps under light usage and drops dramatically (below 10 fps) when screen is filled.

It installs every dependencies
It installs to the /opt
Contains menu launcher
Game area is 383*200 (game units), which is low comparing to the desktop version
-> And you can't use save files from desktop versions (as far as I know)

Issues: (feel free to discuss and contribute)
*Some texts are overlapping (There are too much stuff on the bottom row)
*False positive: "A new version is available - click here!"
*Missing keys on key-layout: ESC,alt, Insert,backquote, TAB and Caps Lock are all used.
*No right-mouse-button, middle-mouse-button, mouse-wheel nor mouse-on-hover.

Upstream: http://powdertoy.co.uk/
Code for Maemo version: https://github.com/aapo/The-Powder-Toy