0.01: New app!
0.02: Better controls, implement game over.
0.03: Implement mode and level selection screens.
0.04: Bring back old controls as "swipe" in menu, exit with button press
0.10: Major overhaul: added score, levels, bugfixes and misc, inspired by NES tetris
0.11: Save/Restore game state
0.12: Minor code improvements