Alpha 6, new levels

Levels 2-1 and 2-2 are there, with their mobs! The levels from world 1 were a bit changed to make them slightly easier (and sometime less frustrating), now that the game can last longer. But the ball was made slightly faster from start, just to spice things up a little.

There is still no continues, so to go through the world 2, you will have to virtually clear the 1-credit achievement, although is not unlocked yet by the way :P

The regular blocks were also redesigned, to have more visual difference from the other blocks outside color. It should also be compatible with a future hi-contrast mode...

This release also includes a few fixes (and probably some new bugs...), like effectively deleting the profile and some scoring issue on the last level cleared.