Space Invader Simulator 20XX

Left and Right arrows to move. Hold X to charge a shot (longer its held, the faster it moves).Hold Z for focused movement (so you dont over shoot into a bad place).Only other thing kind of special is 3 enemies types. A standard down shooter, a spread shooter, and a homing shooter. The chances of these enemies replacing standard enemies goes up for each stage you complete. Why Space Invaders? Rami Ismail of Vlambeer said in an ask.fm response suggested that good first games to make (in terms of s...