Fuel is limited and ore makes you heavier. You can escape the meteor with just one tonne of ore, but the goal is to recover all of it.
This is the first game I've done with sound, although on all the platforms I've tried (Ubuntu, Windows 7 and Android) the sound suffers from an annoying latency. The game works well with the PyGame subset for Android but as PyGame doesn't handle multi-touch devices yet, I can't emulate the buttons on a touchscreen, so it will only be playable with a keyboard.

I'm not particularly pleased with either of these games, but I've forced myself to bring them to a point at which I can publish them, as I otherwise tend to abandon old projects while half-finished and start on new ones.
Both games are available from my 2dgames repository on github and are MIT licenced: https://github.com/jmacarthur/2dgames. As before you'll need PyGame to play them; as I get better at creating games, I'll consider packaging some of them up or porting them so they can be played more easily.